LightSpace CMS Profiling User Manual

LightSpace CMS has many options, tools, and capabilities for a range of colour workflow management, including display calibration, LUT conversion and manipulation, Look Management, and more.

This User Manual helps understand what each button and function with LightSpace CMS can do when profiling a display, and what options are associated with each function.

Directly click the menu images to explore the various options - clicking on a menu or button will take you directly to an explanation of its functions.

Note: only those menu options associated with probe integration are active within this section of the manual.

Display Profiling & Calibration

Menu Bar
Click any menu name or button to see details of its use

File Menu Tools Menu Calibration Interface Display Characterisation (Profiling) Network Manager for Remote Calibration Colour Space Conversion (& build LUTs from Profiles) Manage Colour Space and Profiles

The advanced level of accuracy provided by LightSpace CMS has lead many of the world's leading display manufacturers to partner with Light Illusion for display calibration, including Konvision, Osee, TVLogic, Flanders Scientific, Eizo, Dolby, Bon, SmallHD, Convergent Design, NEC, and many more.

File Menu

Upload LUT Data File

The File menu displays a drop-down menu with a number of file management options, of which the 'Upload' is of interest for display profiling.


Upload

LUT Upload

The Upload function connects LightSpace CMS to LUT boxes or monitors via COMs port, USB or Ethernet.

The 'Com Port' option, when available, selects the Coms Port for communication. With some devices this option may not be available due to direct USB communication, or may request an IP address, as required.

The 'Calibration Patches' option sets the Closed Loop patch size for profiling.

The 'NULL Cube' option is used to re-set the calibration LUT (and any associated settings) back to a unity configuration.

To close the LightSpace connection to the device being controlled, set the 'Calibration Patches' selection to 'Off', and close the Upload menu.

For information on using the 'Upload' function see the individual Hardware Integration Guides.
(Return To File Menu Options)


Tools Menu

LightSpace CMS Calibration Tools LightSpace CMS Colour Space Management Tools LightSpace CMS Colour Space Management Tools

The Tools Menu is dedicated to all the Calibration and Profiling capabilities of LightSpace, as well as its image processing capabilities.

Please see the LUT Management Manual for further details on image processing.


Calibration

The Calibration Menu opens a drop down menu with options for display calibration.

Display Calibration Options
(Return To Tools Menu Options)

Calibration Interface Display Characterisation (Profiling) Network Manager for DIP (Display Independent Profiling)
Discoverable Probes

The Discoverable Probes Menu opens a drop down menu with options for the various probes to be integrated with. Select those required, and use the 'Change Probe' button within the 'Options' menu to switch between probes.

Discover Probes Options
(Return To Tools Menu Options)


Colour Space

The Colour Space Menu opens a drop down menu with options for colour space management.

Colour Space Management Options
(Return To Tools Menu Options)

Convert Colour Space & Auto LUT Building Manage Colour Spaces & Profiles

Calibration Interface

The Calibration Interface Menu provides access to all the tools required for manual display calibration and Quick Profiling.

LightSpace CMS Calibration Interface
(Return To Main Menu Options)

Luminance Display Close Calibration Interface Menu Calibration Patch Colour Colour Patch Values Manage Colour Space Colour Standard Target Values Colour Sliders Step Step Value Use Percent Link Sliders Cancel Quick Profile Quick Profile Network Manager Probe Setting Options Stop Measurements Measure Display Values Active Measurement values Gamut CIE xy Display Gamut CIE uv Display Gamma Display DifGamma Display RGB Separation Display RGB Balance Display Delta-E Delta-E Distribution Gamut, Gamma and RGB Separation Display Zoom Measure Bars Measure
Graphs

The various graphs enable visible feedback when taking measurements, or different parameters to be assessed after a Quick Profile has been performed.

Different graphs are available depending on the measurements that are being/have been performed, with some graphs only being visible after a Quick Profile has been performed.
(Return To Calibration Interface Menu)

Gamut CIE xy

The Gamut CIE xy tab changes the main graph display to show the selected chart preference. The display shows the target colour space gamut values and the actual measured results.

Gamut Display
(Return To Calibration Interface Menu)

Gamut CIE uv

The Gamut CIE uv tab changes the main graph display to show the selected chart preference. The display shows the target colour space gamut values and the actual measured results.

Gamut Display
(Return To Calibration Interface Menu)

Gamma

The Gamma tab changes the main graph display to show the selected chart preference. The display shows the target gamma values and the actual measured results.

Gamma Display
(Return To Calibration Interface Menu)

DifGamma

The DifGamma tab changes the main graph display to show the selected chart preference. The DifGamma display shows differential gamma values, with points above the line having a lower gamma value, so showing a lighter image display, and points below the line having a higher gamma value, so a darker image display.

Dif Gamma Display
(Return To Calibration Interface Menu)

RGB Separation

The RGB Separation tab changes the main display to show the profiled display's RGB channel separation. The graph shows the RGB channels compared to a perfect display, with a poor graph showing display cross-coupling errors.

Note: For the RGB Separation graph to plot and make valid sense the profile must have the same patches within the Primary RGB patch sequences as within the Grey sequence.

RGB Separation
(Return To Calibration Interface Menu)

RGB Separation

Quick profiles can be used to build 3D Calibration LUTs for displays that have good RGB separation, acceptable RGB Balance, and a gamut wider than the target. For displays with less than perfect RGB separation, poor RGB Balance and low gamut, such Quick Profile generated LUTs will not be guaranteed accurate, and full 3D profiling via Display Profiling will be required to generate a full display profile for an accurate calibration LUT.

Bad RGB Separation shows issues with the independence of the display's colour channels, with cross-coupling of the red, green, and blue colour channels such that when an input colour change that should affect only a single colour channel also causes changes within the other colour channels.

Post-calibration RGB Separation

It's possible that post-calibration, RGB Separation will be worse than pre-calibration, if the display has a gamut that is smaller than the target gamut. This is because the calibration process will have to deliberately introduce cross-coupling to accurately calibrate the display within the available gamut.

RGB Separation Pre-cal
RGB Separation Post-cal

Note: For the RGB Separation graph to plot and make valid sense the profile must have the same patches within the Primary RGB patch sequences as within the Grey sequence.

RGB Balance

The RGB Balance tab changes the main display to show the profiled display's RGB Balance, which is the same as colour temperature. The graph shows the RGB channels compared to the target colour space.

RGB Balance
(Return To Calibration Interface Menu)

Delta-E

The Delta-E tab changes the main display to show the profiled display's grey scale Delta-E accuracy, which is the combination of Gamma and RGB Balance. The black line on the graph defines the JND threshold (Just Noticeable Difference), which is a perceptual limit of 2.3. Above this value colour difference are visual, below not so. The green line is Delta-E 1976 (standard Delta-E), and the blue line is Delta-E 2000.

Delta-E
(Return To Calibration Interface Menu)

Delta-E Distribution

The dE Dist tab changes the main display to show the profiled display's Delta-E Distribution accuracy for all the measured points within the profile. The graphs show percentage in the vertical axis, and Delta-E in 0.5 step increments in the horizontal, so the more 'left and high' the graphs is, the better the result. The green line is Delta-E 1976 (standard Delta-E), and the blue line is Delta-E 2000.

Delta-E Distribution
(Return To Calibration Interface Menu)

Brightness Thermometer

The Brightness Thermometer provides real-time feedback on the measured brightness of the display, showing the measured value in nits (cd/m2).
(Return To Calibration Interface Menu)

Active Measurement Values

The Active Measurement Values display provides further real-time feedback of the measured values, showing brightness result as nits (cd/m2), as well as the xy coordinates of the colour value being measured. The RGB values show the target colour (the Patch Colour) as normalised percentage values from 0 to 1.
(Return To Calibration Interface Menu)

Patch Colour

The Calibration Patch Colour shows the colour LightSpace is generating and therefore the colour it is expecting to be measuring. If using DIP mode (Display Independent Profiling) it is important the colour shown here matches accurately the separately displayed colour.

Clicking on the patch colour will open the full profiling patch window, which can be positioned and re-sized, after it has been detached from the main Calibration Interface window. There is also position and size data in the top of the border, enabling accurate size and position to be attained. A double click on the window will remove the border totally.

Profiling Patch Window
(Return To Calibration Interface Menu)

DIP (Display Independent Profiling)

DIP is a process where the actual display being measured is not directly connected to LightSpace, or being controlled by the Network Java Application or DI system Plug-in, such as the Scratch Plug-in. This can be required if the DI system has an output that is isolated from the underlying OS - such as with Quantel systems (as they are have never actually developed the Plug-in they announced some years back!). The process is simply to play the same colour patch from the DI system time-line as LightSpace itself is expecting. When getting into real profiling (Display Characterisation) the time line needs to run at the same speed/duration as the output from LightSpace, but only within a 'close' sync relationship - quarter of a second. More on this when discussing Display Characterisation, but it is worth downloading the DIP Mode Calibration EDLs to help facilitate this mode of calibration.

Zoom Measure

The Zoom widget shows the accuracy of the present colour being measured, enabling a display's manual controls to be adjusted to gain a more accurate reading.
(Return To Calibration Interface Menu)

Bars Measure

The RGB bars within the Bars Widget show both Colour Balance and Luminance Offset. If the RGB bars are equal height, but above or below the centre line it shows the Colour is correct, but the Luminance is incorrect (high or low). If all three bars are at 'zero' it shows both Colour and Luminance are correct.

The White Bar shows Delta-E, so when all bars are at zero the calibration for the colour being measured is accurate.
(Return To Calibration Interface Menu)

Colour Patch Values

The Colour Patch Values show the active patch value being used. The values can be set numerically, or via the associated sliders.
(Return To Calibration Interface Menu)

Colour Sliders

The Colour Sliders enable any patch colour to be set for Manual Measurement. The associated up/down arrow buttons will always step by single increments regardless of the 'Step' setting, while clicking above or below the 'slider' handle will step the slider by the 'Step' amount.
(Return To Calibration Interface Menu)

Step Value

The Step Value set the increments that the patch colours will change in, using the Keyboard up/down arrow keys to increment/decrement the present patch values. Clicking above or below the 'slider' handle will step the slider by the 'Step' amount.

Alternatively, selecting one or more of the 'Link' check boxes will enable the keyboard Up/Down arrow keys to be used.
(Return To Calibration Interface Menu)

Percent Option

The Percent tick box set the patch colours to be displayed as percentage values, rather than integer bit values.
(Return To Calibration Interface Menu)

Colour Sliders

The Colour Sliders can be set to be used in different ways, depending on the way the 'Step' value is set, in combination with the ability to click directly on the slider path above/below the slider location.

For example, setting the 'Step' value to 255, turns the sliders into one-hit buttons for quick 100% R, G, B, C, M, Y settings. Setting the 'Step' value to 191 provides one-hit 75% settings.

Colour Sliders set to Black
Colour Sliders set to Red

With the Step value set to 255, clicking on the space above the 'R' slider will make the patch colour jump to 100% Red.

Link Sliders

The Link Sliders tick boxes will link the selected sliders together, so enabling any colour offset to the stepped through, either via the sliders or through use of the 'Step' function. It is possible to 'Link' just one slider, so that primary colours can be stepped through with the keyboard Up/Done arrows. Linking two sliders will enable secondary colours to be stepped through, etc.
(Return To Calibration Interface Menu)

Colour Standard Target Values

The Colour Standard Target Values show the primary (RGB), secondary (CMY), and white (W) point target values for the colour space selected via the drop-down menu situated below these target value boxes. The active patch colour is shown highlighted in light blue.
(Return To Calibration Interface Menu)

Colour Space Selection

The Colour Space Selection drop-down menu selects the target colour space from a selection of pre-sets spaces, as well as any user saved spaces.

As each colour space is selected the CIE diagram shows the colour coordinates, including primary and secondary, and the gamut profile.
(Return To Calibration Interface Menu)


Measure Display Values

The Measure Display Values menu opens a new drop-down selection of direct measurement options, depending on the probe being used.

Calibration Interface Measure Menu

Measure: will start the connected probe making continuous measurements, with each measurement reported within the Active Measurement value boxes, as well as visually within the gamut CIE diagram, and the Zoom widget display.

Measure and Log: will open a browser window allowing a location to be selected for a .vs file of all measurements made to be saved. This can be very helpful when comparing a displays stability over a number of days.

Additionally, the Measure and Log function can be used to record the time taken for any given patch to be read, so can be used to define the longest time taken to read dark patches, which is the 'time' setting needed for DIP mode profiling.

Manual Mode and Log: will also open a browser window allowing a location to be selected for a .vs file of all measurements made to be saved. The difference is that on a Hubble probe the blue 'manual' button is used to make individual measurements, and save them to a .csv file.

−=NO LUT=−: and the associated options (ColourSpace Image which will be a list of any LUTs presently within LightSpace, and Load Active LUT, which enables any external LUT to be loaded) allow any LUT to be users as an Active LUT, which will modify the patch colours by the LUT values - ideal for LUT checking before uploading into a display or LUT box.
(Return To Calibration Interface Menu)


Quick profile

The Quick Profile menu opens a new window providing options for performing Quick Profiles of any display using a range of patch sequences, from 21 step Grey only, RGBW, or RGBCMYW, to Gamut Sweeps and memory Colours, as well as User Defined sequences, ideal for quick display verification, including the tools required for DIP (Display Independent Profiling) mode.

Calibration Quick profile Menu

Inbuilt: tab provides a drop-down selection menu that enables desired in-built Quick Profile types to be selected. The options are:

  • Grey Scale Only
     Can be used for Peak Chroma/Luma LUT generation, not Fit/Fix Chroma, and cannot plot RGB Separation graph data
  • Primary Only
     Can be used for any LUT generation, and will plot all graphs
  • Primary & Secondary
     Can be used for any LUT generation, and will plot all graphs
  • Memory Colours
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data
  • Memory Colours with Secondaries
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data
  • Gamut Sweep 75%
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data
  • Gamut Sweep 75% with Secondaries
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data
  • Gamut Sweep 100%
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data
  • Gamut Sweep 100% with Secondaries
     Cannot be used for any LUT generation, and cannot plot RGB Separation graph data

When a Quick Profile has been performed, the 'Display' graphs accessed via 'Manage Colour Spaces' change to represent the required data plots.

Memory Colours
Memory Colours

Gamut Sweep
Gamut Sweep

DPX Frames: tab provides the ability to navigates to a folder where user generated calibration patches have been saved in .dpx format. With this capability any user generated .dpx patches can be used to define the Quick Profiling sequence.

CSV File: tab will load a user generated Quick Profile sequence of calibration patches, defined as a CSV file.

Export Colour List: will export a CSV file of the patches needed to perform a Quick Profile via DIP mode - the exported CSV file can be used as the basis for a User Generated Quick Profile patch sequence.

Export Patches: will export dpx frames of the patches need to perform a Quick Profile via DIP mode - the exported frames can be SD (720x576), HD (1920x1080), or 2K (2048x1556).

Quick Profile Calibration

Quick profiles using, or based on, Primary Only, and Primary & Secondary sequences (not Gamut Sweeps or Memory Colours) can be used to build 3D Calibration LUTs for displays that have good RGB separation, acceptable RGB Balance and wider that target gamut, as well as performing Quick Verifications of display calibration. For displays with less than perfect RGB separation, bad RGB Balance, and/or low gamut LUTs generated from a Quick Profile will not be guaranteed accurate, and full 3D profiling via Display Characterisation will be required.

Quick profiles using, or based on, Grey Only can be used to build 3D Calibration LUTs with Peak Chroma and Peak Lum, but not Fit/Fix Chroma

Bad RGB Separation shows issues with the independence of the display's colour channels, with cross-coupling of the red, green, and blue colour channels such that when an input colour change that should affect only a single colour channel also causes changes within the other colour channels.

The definition of good RGB Balance is more obvious as it means the grey scale is reasonably close to the required target colour temp.

Note: There are presently some restrictions on the use of 'User Generated' Quick Profile sequences, with the patches needing to be in the order Grey,R,G,B, and match the present Quick Profile orders for Primary only, Grey Only, etc., with the same capabilities for LUT generation and graph plotting as outlined for the fix internal Quick Profile sequences.
(Other patch orders/random patches will profile and plot, within the defined restrictions for RGB Separation, making them ideal for display verification, but will not generate valid LUTs.)

Select Time Per Frame: when in DIP mode the slider selects the time each calibration patch is displayed for - different values are required for different probes when using DIP mode for profiling. For Closed Loop Mode (direct connection profiling to LightSpace) the probe controls LightSpace so the value is then irrelevant, and the time per patch is variable.

The two radio buttons select between DIP and Closed Loop profiling modes.

In DIP mode different values are required to be set for different probes, and even for different display types, as displays with deeper blacks will require longer times.

DIP Mode Timings

The only way to verify the actual timings required for DIP Mode is to 'time' (with a stop-watch) the duration any given probe/display combination requires when measuring dark patch colours - not just black, but dark R, G, and B patches. The longest time, plus one second, must be used as the time for all patches in DIP Mode.

To take such time duration measurements use the live 'Measure' mode with colour patches displayed manually via whatever DI or colour system is connected to the display to be profiled.

In Closed Loop Mode timings are defined by the probe reporting back to LightSpace when it has a steady valid reading, so times per patch are variable.

Start: opens a new windows that allows a name to be entered that the profile will be saved as. It is best to use something that readily identifies the profile from any others (display and probe combination for example).

Perform Quick Profile

OK: will accept the entered name and bring up a 30 second delay window so you can leave the room and close the door before profiling commences. To cut short the delay and start the characterisation process immediately, simply click 'OK'.

Press OK to start...

Total Frames: displays the total number of frames that will be used for the Quick Profile - 21 patches per colour, but with black only used once.

Total Time: displays the total time taken for the Quick Profile using the select frame count and Time per Frame, that will be used for the Quick Profile. This is valid only for DIP mode.

Active LUT: enables any LUT presently held within LightSpace CMS to be applied to the patches as they are displayed. This means any generated LUT can be checked for function.
This usually needs to be set to −=NO LUT=− when performing initial display profiling, although can be use with a rescaling LUT to adjust the range of the profiling patches, say from Data Range to TV Legal.

Active LUT

The Active LUT function applies any selected LUT to the calibration patches output from LightSpace CMS, adding the LUT properties to the patches.

The obvious application for this is to re-profile a display using the calibration LUT generated from an initial profiling process. If the calibration LUT is accurate the resulting profile will show unity data.

Calibration Target
Actual Profile
Calibrated Result

In the above images the first cube shows the target calibration. Effectively, what a perfectly calibrated display would look like when compared to the target colour space and gamma (basically, the LUT is a unity or bypass LUT, doing nothing, as the underlying display would be 'perfect').

The second cube shows the actual display profile compared to the first cube. Here it can bee seen there is too much green gamut (in the LUT it can be seen Green is being pulled-in, as the LUT is compensating for there being too much green in the display), but not enough blue (as blue is pushed to the cube boundary, as the LUT attempts to increase Blue, which is impossible), as is also shown in the following CIE diagram of the original profile data. Red also has a non-linear distortion as can be seen in the right hand corner of the cube.

Calibration Profile

The final cube shows the results of the calibration, with a profile having been performed via an 'Active LUT', and shows that the centre section of the calibration is very close to accurate, while the extremities of the gamut are as close as can be for the limited original gamut of the display.

The following CIE diagram shows the same display re-profiled with the calibration LUT applied (the same as cube 3 above). As can be seen, the calibration is now accurate where it can be, with similar errors where the original display gamut just can't match the target.

Calibration Result

Close: will abort and close the Quick Profile window.
(Return To Calibration Interface Menu)

Stop

Stop (visible on the main Calibration Interface menu) stops the present profile measurement or profile operation.
(Return To Calibration Interface Menu)

Cancel Profile

Cancel (visible on the main Calibration Interface menu) canceles the recorded Quick Profile in readiness for a new Quick Profile to be performed.
(Return To Calibration Interface Menu)


Options

The Options menu provides controls for setting any user adjustable probe and graph options applicable to the probe and display in use, and the function being performed. The available options will vary as required.

Additionally, menus for probe matching are provided, enabling an offset matrix to be used to match one probe/display combination to a different probe (ideally on the same display). This enables a fast, cheaper filter based probe to be matched to a more expensive and slower spectro, improving the accuracy of the filter probe.

Further, manual offsets can be entered for different display technologies, when such offsets are provided by the display manufacturer.

Options Menu

Probe Matching

Integration Time: sets the amount of time the probe will integrate light reception over, if applicable. Some probes will ignore these setting, other will use them as time settings, others will select from probe pre-sets. In general, the longer the Integration Time the more accurate the reading, but the slower the profiling. But, setting too long a time can cause the probe to over saturate... You can think of integration time as being like exposure time in a camera.

With plasma profiling there is a variation with respect to integration time. Due to plasmas PWM (Pulse Width Modulation) the optimum integration time is calculated as an integer multiple of the PWM frequency of the corresponding display.

So, as an example, in PWM-based Display that has a frequency of around 180Hz, the integration time should be an integer multiple, i.e., n*(1/180) so if n were 500 (and n can be any large integer value) then we obtain the following:

Integration time 500*1/180 = 2.78 seconds.

The more accurate the integration time, the better the results.

Max Exposure Time: enables probes with an exposure time limit to be set for DIP mode operation.

Sync Frequency: enables probes with auto and manual sync frequency capability to be set for the function required.

Extra Delay Time: sets a delay after the patch has been changed, before the probe measurement starts. This can deal with delays in the image pipeline, and allow Plasmas to overcome their inherent 'image burn' issues.

Change Probe: enables the active probe to be changed. To use, press the 'Change Probe' button, and then disconnect the present probe. Connect the new one, and wait for the new probe to be recognised - you may need to 'cancel' the Coms Port pop-up window if the probe you are connecting doesn't use a Coms Port connection.

Active Probe/Display Data: the attached probe and display combination can be 'profiled' and used in combination with recalled Reference Probe/Display Presets to match the active probe to the Reference probe.

Probe Matching

Probe Matching is a technique used to 'calibrate' one probe and display combination to another probe, on the same display. This means faster and cheaper filter based probes can be matched to slower and more expensive spectrometers, increasing the profile accuracy, while benefiting from the filter probe's speed and better black level reading.

Probe Matching Process
  • Attach the first probe, selecting standard probe parameters as required
    (As this will ba a Tri-stimulus probe use the probe's 'default' matrix pre-set, not a display specific one as you are building your own 'matrix')
  • If using the LightSpace inbuilt patch generator, enter a matrix name and press 'OK'
    (Use a name that includes the display and probe details)
  • Place the probe on the patch window and press 'Measure'
  • The patch window will cycle R, G, B and W patches, and save the probe/display matrix data
  • Change the probe to the second (Spectro) probe, and repeat the process
    (Be aware Spectro's do not use matrix pre-sets)
  • If using a separate patch window, not controlled via LightSpace, use the RGBW 'Update' buttons in-turn
    (Each patch colour needs to be a value of 240 to match the LightSpace patches)
  • Enter a name for matrix when prompted
    (Use a name that includes the display and probe details)
  • With the probe placed on a patch of the matching colour press 'Measure' to take a measurement
  • When White is measured the Luma value will be updated too
  • Alternatively, manually enter the xy values, remembering the Luma value too when reading White
    (As with direct LightSpace matching, the colour patches MUST be based on 240 data, NOT 255)
  • Select the Reference Probe/Display matrix from the lower drop-down menu
  • Select the Active (in-use) Probe/Display matrix from the upper drop-down menu
  • All measurements will now be 'corrected' using the Probe/Display matching function
    (You must always use the Tri-stimulus probe's 'default' matrix pre-set, as used when performing the probe matching!)

See the Probes - User Guide for further information.

Import, Export, Delete: provide for the management of any stored probe/display combination presets.

Update: the separate 'Update' buttons allow individual user updates of the RGBW values, either by direct patch reading, or via operator value input.

Update Colour

Measure All: will use 'closed-loop' mode to run a fully automatic RGBW Probe Calibration sequence on the active probe/display combination.

LUM: is the peak Luminance value for the measured probe/display combination.

Reference Probe/Display Presets: recalls probe/display presets to use as the reference, or offset, for the active probe/display combination.

Luminance Units: sets the units used on the vertical luminance measurement bar on the main Calibration Interface window, as well as setting the display's expected Min and Max Luminance values, which are used to calculate the 'Target' Y values and Delta-E values for Manual Calibration, as well as for use within the different charts, and can be set manually, or automatically via the Update button.
(For initial profiling these values should be set manually to the ideal display values - such as 0.05 Nits Min, and 100 Nits Max, as is defined for a Grade-1 professional display.)
(Note: All LightSpace measurement units are in Nits.)

Display Type: provide options for some probes, depending on the probe being used. Example options include LCD/CRT/BURST/AIO for the i1 Display Pro, which are used to select probe's Sync mode.

Note: Display Type means the mode of image display, such as line scanning with CRT and Pulse Width Modulation with BURST, not that actual display type - as a result some LCD displays with excessive flickering will profile better with the 'BURST' setting. There are no fixed rules - but BURST or AIO can often fix issues with CRT or LCD modes.

Probe Offset: enables a user to manually enter offset values for different probes/displays. Check with display manufacturer's for the correct values to be used.

Calibration Settings: provide options for probe use, depending on the probe being used. Example options include the back-light type for some contact probes (i1D3 for example). See the display manufacturer's information for the correct selection to use.

Average Low Light Measurements: will increases the accuracy of low-light measurements by averaging multiple readings using an advanced algorithm built into LightSpace. The algorithm varies based on the probe in use to always provide the best possible results.

Note: Average Low Light Measurement will greatly extend the time taken for DIP Mode profiling - be aware when using in this mode.

Enable Visible Feedback: turns on/off the pointing laser on some probes (such as Hubble, Jeti 1211, and Klein K10-A) to aid probe alignment, and turn on/off LED feedback on probes such as the i1 Display Pro.

Probe Calibration: performs a calibration pass on the attached probe, which may be a black or white calibration depending on the probe. Follow the on-screen instructions.

OK: will accept any menu changes and close the menu.

Cancel: will abort and close the Options window.

Close
Yup, another one of those damn 'Close' buttons!
(Return To Calibration Interface Menu)


Network manager

The Network Manager menu allows a network connected Mac/PC/Linux system to have its displays measured and profiled via LightSpace CMS on running on a sperate PC connected via Ethernet (WiFi may work if the bandwidth is good and there are no interrupts... but it is not guaranteed!).

Enable: enables the network manager. This needs to be set before the Java Application on the remote PC/Mac/Linux system is enabled.

Disable: simply disables the network connection.

Port: shows the active communications port for the network connection.

Patch Indent/Size: these percentage value boxes set the patch size/position for external patch generators that use these commands, such as the LightSpace CMS Java App window.
(See below for further details of setting the Patch Indent/Size values)

Background Colour: sets the background colour when a smaller than full size profiling patch is used.

Server IP Address: shows the IP address of the PC that LightSpace is active on. Use this IP address within the networked PC/Mac/Linux system running the Java Application to make an active connection .

1 available client/s: shows how many available clients (systems running the Java App) are active as more than one can be connected at any given time.

Extra Delay Time: is duplicate of the same setting with the 'Options' menu, as allows for a delay time in seconds to be set before the probe starts reading after a patch change has occurred.

Close: After a network connection has been established 'close' the Network manager and initiate profiling as normal. The Java Application on the networked system will display the same colour patches as on LightSpace.
(Return To Calibration Interface Menu)

Patch Indent/Size & Extra Delay

The Patch Indent/Size & Extra Delay controls within the LightSpace Network Manager can be used to set any specific patch size and position for display profiling, as well as a delay for probe measurement.

Note: The Patch Size/Indent options are a 'work-in-progress'...

The 'Diagonal' box enables the selection of patches based on the ICDM Lxx sizes, which are defined as a percentage of the screen diagonal size. The 'Area' box shows the equivalent screen area percentage for the selected patch. It is possible to enter the desired area percentage manually.

The 4 indent values are also in percentage terms, and can be used to set a Custom width and height of the patch window, as well as the position.

To reposition the patch you simply add/subtract the same value from the apposing percentage boxes, which will reposition the patch, while maintaining the same patch size.

The 'Extra Delay Time' setting is duplicate of the same setting with the 'Options' menu, as allows for a delay time in seconds to be set before the probe starts reading after a patch change has occurred. This is required when using an external patch generator (such as LightSpace Connect) with an in-built delay, meaning the patches on the display being profiled occur out of sync (delayed) with respect to the patch changes within LightSpace. Such a delay is easy to see visually, and a corresponding value entered to counter the visual delay.

Note: If using an external patch generator that has no understanding of patch size and/or background colour, set the Indent/Size controls to 0%, and keep the Background Colour set to the default black.


Network Profiling

When LightSpace CMS is installed a sperate Java Application (called 'Calibration Client') is installed along with the main software, and can be seen within the main PC's 'Programs' list. It is a stand-alone Patch Generator, directly controlled via LightSpace CMS over a network.

This application can be copied and loaded into any other system (PC/Mac/Linux) running Java to enable calibration of displays over a facility wide network.

This means that with LightSpace CMS running on PC, with probe attached, the patches can be displayed on any display connected to any other PC/Mac/Linux system on the same network.

In the shown configuration diagram LightSpace CMS is running on the laptop, with the Java App running on the Mac, connected to the LightSpace laptop via Ethernet. When LightSpace generates a patch colour the same colour is replicated on the Mac via the Java App, and the probe records the measured value and sends it to LightSpace CMS.

Patch size, position, colour and background colour can all be controlled via the 'Network Manager', with a double click on the 'Calibration Client' forcing it to become full screen size, and will remove the window border.

Display Characterisation

The Display Characterisation menu controls all options for full display profiling using a pre-set sequence of calibration flats self generated within LightSpace.

Cube Folder CSV File Close Toggle Status Window Characterisation Measure Options Manage Colour Spaces Network Manager Select Cube Size Active LUT Export Patches Export Colour List Total Time Total Frames Select Time per frame Patch Sequence Format Close When Done
Cube

The Cube tab provides access to the option available for selection the size of the cube to be used for profiling, using the 'Select Cube Size' slider control.
(Return To Display Characterisation Menu)

Folder

The Folder tab navigates to a folder where user generated calibration patches have been saved in .dpx format. With this capability any user generated .dpx patches can be used to define the profiling colour sequence.
(See below for further information on using .dpx patch sequences.)
(Return To Display Characterisation Menu)

CSV File

The CSV File tab will load a user generated sequence of calibration patches, defined as a CSV file.
(See below for further information on using CVS patch sequences.)
(Return To Display Characterisation Menu)

Measure

The Measure button will open a selection of new windows all linked with display characterisation, and initiating the profiling process. Before the Measure process is initiated all other settings and options must be set as required for the probe and display in use.

Please enter a name: allows a name to be entered that the profile will be saved as. It is best to use something that readily identifies the profile from any others.

Perform Display Characterisation

OK: will accept the entered name and bring up a 30 second delay window so you can leave the room and close the door before profiling commences. To cut short the delay and start the characterisation process immediately, simply click 'OK'.

Press OK to start...

Cancel: aborts the display characterisation process.

Calibration Status Window: shows the actual colour being measured via a real-time feedback 'cross', as well as showing how far through the actual characterisation process is via a vertical thermometer and percentage display.

Pause: allows for the profiling process to be 'paused' to interrupt the readings being taken.

Calibration Area Window: displays each colour patch in turn, and can be resized and positioned as required for direct connected display profiling.
(Return To Display Characterisation Menu)

User Custom Patch Sequences

User generated patch sequences can be imported both as CSV files, using RGB triplet data to define the colour patches to use for profiling, and as .dpx images with each image being a desired patch colour.

This allows any sequence of colour patches to be used for profiling, enabling for example sequences to be generated that focus more on skin-tones, or other 'memory colours', or to use a cube for profiling that is greater than the in-built maximum of 21^3 patches.

Note: Depending on the actual patch colours used the various 'display graphs' may not show understandable plots, as specific patch colours are required for the different graphs - for example a valid 'Gamma' plot requires a full sequence of grey scale patches, and RGB Separation requires matched Grey Scale and RGB Primary patches.

A good starting point is to export a standard patch sequence as a .csv file, and/or a .dpx image sequence, and edit the CSV file, or the .dpx image sequence, to become a new User Generated sequence.

As with standard profiling, Drift Compensation can be set to automatically insert a 'near white' patch every 'nnn' frames, providing information on display and probe drift that can be later used when generating the calibration LUT.
Note: The Drift patches should not be included within the .csv file or .dpx images.

Toggle Status Window

The Toggle Status Window will show or hide the characterisation display window. This window shows the active colour being measures via a CIE display, as well as a time thermometer showing how much of the characterisation has been performed.

Display Characterisation Ststus Window
(Return To Display Characterisation Menu)

Close

Close the Display Characterisation menu, and abort the process.
(Return To Display Characterisation Menu)

Select Cube Side

The select Cube Side slider defines the cube size of the profile to be performed. As a rule, the larger the cube size the better and more accurate the profile result. As a minimum a cube size of 10 is recommended for accurate profiling, with smaller cube sizes used for quick check profiles.

The associated 3D Cube and Hybrid 1D + 3D options select the type of profiling to be performed - full 3D Cube based, or a combination of 1D and 3D Cube.
(Return To Display Characterisation Menu)

Patch Sequence

The Patch Sequence options define the ordering of the calibration patches - either Sequential colour, or Anisometric, which is non-sequential, and based on distance vector diversity. The choice of which sequence to use is defined by the display technology being profiled.

Anisometric sequences are better suited to displays that have any form of ABL, such as Plasmas, and which also includes HDR displays where Sequential patch ordering can cause display overheating.

The Drift Compensation option will insert a 'near white' patch every 'n' frames, which are used when generating LUTs from the profile to cancel out any display or probe related drift during the profiling process.
(Return To Display Characterisation Menu)

Select Time per Frame

When in DIP mode the slider selects the time each calibration patch is displayed for - different values are required for different probes when using DIP mode for profiling. For Closed Loop Mode (direct connection profiling to LightSpace) the probe controls LightSpace so the value is then irrelevant, and the time per patch is variable.

The two radio buttons select between DIP and Closed Loop profiling modes.

In DIP mode different values are required to be set for different probes, and even or different display types, as displays with deeper blacks will require longer times.

As a Guide for LCD displays:

  • K10-A: 1 secs per flat
  • Jeti 1211: 4 secs per flat
  • i1 Display Pro: 4 to 12 seconds per flat
  • i1 Pro 2: 6 to 10 secs per flat
  • CS-200: 2 to 12 secs per flat (depending on probe physical settings)

Some probes, such as the i1-D2, do not provide fixed duration measurement, and are therefore not controlled by the DIP/Closed Loop options, and cannot be used for DIP mode profiling.
(Return To Display Characterisation Menu)

Total Frames

The Total Frames information box shows the total number of frames required for the given cube size.
(Return To Display Characterisation Menu)

Total Time

The Total Time information box shows the total duration in minutes and seconds for the profile to be completed for the given cube size.
(Return To Display Characterisation Menu)

Export Colour List

The Export Colour List button will export a CSV file of the patches needed to perform a Display Characterisation via DIP mode - the exported CSV file can be used as the basis for a User Generated calibration patch sequence.
(Return To Display Characterisation Menu)

Export Patches

The Export Patches button will export dpx frames of the patches need to perform a Display Characterisation via DIP mode, or to be later re-imported via the DPX Import tab - the exported frames can be SD (720x576), HD (1920x1080), or 2K (2048x1556).
(Return To Display Characterisation Menu)

Close Application When Done

The Close Application When Done tick box will close LightSpace when a Display Characterisation has completed.

Active LUT

Active LUT enables any LUT presently held within LightSpace CMS to be applied to the patches as they are displayed. This means any generated LUT can be checked for function.
This usually needs to be set to −=NO LUT=− when performing initial display profiling, although can be use with a rescaling LUT to adjust the range of the profiling patches, say from Data Range to TV Legal.

For more information on use of the Active LUT function within LightSpace CMS see the Active LUT info box.
(Return To Display Characterisation Menu)

DIP (Display Independent Profiling)

DIP is a process used when the actual display being measured can not be directly connected to the LightSpace PC, or cannot be profiled via the Network Java Application, or via DI system direct interface or Plug-in, such as the Scratch Plug-in or Mistika direct connection.

This profiling mode will be required if the DI system has an output that is isolated from the underlying OS - such as with FCP, Resolve, Avid, Quantel, and BaseLight systems.

The process is to simply play the same colour patch from the creative system's time-line as LightSpace itself is expecting, with the creative system's time line run at the exact same speed and duration as the output from LightSpace, and within a 'close' sync relationship of +/- quarter to half a second.

This means pressing 'GO' on the DI system timeline playback and LightSpace profiling at roughly the same time - within +/- quarter to half a second.

To aid with DIP operation Light Illusion has generated a selection of EDLs to match the main values used for DIP mode profiling - download the Calibration edls to build a DIP patch sequence.

There are edls for both Quick Profile options - Primary Only, and Primary and Secondary - as well as for 10 point and 17 point cubes.

Each edl type is also provided in 3, 6, 8, 10, 12, 14 and 16 second freeze-frame versions.

The correct freeze-time edl to use depends on the probe and the display technology being profiled.

The need is to have the shortest freeze-time edl, while maintaining a lock between the DI system playback and LightSpace, with the DI time-line maintaining a guaranteed real-time playback.

If the DI time-line slips behind LightSpace playback, the problem is with the DI system NOT maintaining real-time playback.

If LightSpace playback slips behind the DI time-line playback the probe is taking longer than the specified freeze-time to read the calibration patches, and a longer freeze-time edl will have to be used.

Convert Colour Space Menu

The Colour Space Conversion Menu opens a window that is used to build LUTs based on different display profiles, allowing conversion and calibration LUTs to be automatically generated.

Please see the LightSpace LUT Management Manual for further details on working with the Convert Colour Space menu.


Manage Colour Spaces

The Manage button opens a new library window where you can manage (import/export/rename/display/delete) any custom colour spaces that have been generated through display profiling, or the alteration of the pre-set colour spaces into new user defined colour spaces. In the image below a profile measurement is highlighted.

Profile Rename Profile Delete Profile Import Profile Export Display Profile Display Close

The Manage window is used to manage all colour space data and display profiles generated by performing a Quick Profile, Display Characterisation, or via film profiling.

Rename

The Rename button allows any profile to be renamed.
(Return To Manage Colour Spaces Menu)

Delete

The Delete button allows any profile to be deleted.
(Return To Manage Colour Spaces Menu)

Import

The Import button allows any profile to be imported into LightSpace CMS, after it has been exported from another LightSpace CMS system.
(Return To Manage Colour Spaces Menu)

Export

The Export button allows any profile to be exported from LightSpace CMS as n XML file that can be opened and edited with any standard text editor as required.
(Return To Manage Colour Spaces Menu)

Display

The Display button opens a new window showing the profile data in graph form, using the tabs to the left of the graphs to select the desired display, as well as showing Min/Max Luma values and Contrast Ratio, and more, including exporting a PDF report of the selected profile.

Display Profile

Colour Space Selection Luminance Detail Luminance Thermometer Delta-E Delta-E Distribution RGB Balance Display RGB Separation Display Gamma Display DifGamma Display Gamut CIE uv Display Gamut CIE xy Display Gamut, Gamma and RGB Separation Display Gamut Triangle Level Filters - Grey Scale Filters - Primary Colours Filters - Secondary Colours Filters - Others Filters - Stimulus Levels Filters - Delta-E Custom Filters Export to PDF

CIE Diagram Point Select

When using the CIE Diagrams it is possible to select any individual point and be presented with additional information, including measured values and delta-E for the selected point.

Point Select

A single click on any point will select it, with a double click popping-up the information box. A right click anywhere on the CIE diagram will re-set everything.

The above CIE diagram shows the use of a 'Custom Filter' to limit the points displayed - see below for further information on Custom Filters.

Close

Close the Manage Colour Spaces menu.
(Return To Manage Colour Spaces Menu)

Gamut CIE xy

The Gamut CIE xy tab changes the main graph display to show the selected chart preference. The display shows the target colour space gamut values and the actual measured results.

Gamut Display
(Return To Display Profile Menu)

Gamut CIE uv

The Gamut CIE uv tab changes the main graph display to show the selected chart preference. The display shows the target colour space gamut values and the actual measured results.

Gamut Display
(Return To Display Profile Menu)

Gamma

The Gamma tab changes the main graph display to show the selected chart preference. The display shows the target gamma values and the actual measured results.

Gamma Display
(Return To Display Profile Menu)

DifGamma

The DifGamma tab changes the main graph display to show the selected chart preference. The DifGamma display shows differential gamma values, with points above the line having a lower gamma value, so showing a lighter image display, and points below the line having a higher gamma value, so a darker image display.

DifGamma Display
(Return To Display Profile Menu)

RGB Separation

The RGB Separation tab changes the main display to show the profiled display's RGB channel separation. The graph shows the RGB channels (cross-coupling errors) compared to a perfect display.

Note: For the RGB Separation graph to plot and make valid sense the profile must have the same patches within the Primary RGB patch sequences as within the Grey sequence.

RGB Separation
(Return To Display Profile Menu)

RGB Separation

Quick profiles can be used to build 3D Calibration LUTs for displays that have good RGB separation, acceptable RGB Balance, and a gamut wider than the target. For displays with less than perfect RGB separation, poor RGB Balance and low gamut, such Quick Profile generated LUTs will not be guaranteed accurate, and full 3D profiling via Display Profiling will be required to generate a full display profile for an accurate calibration LUT.

Bad RGB Separation shows issues with the independence of the display's colour channels, with cross-coupling of the red, green, and blue colour channels such that when an input colour change that should affect only a single colour channel also causes changes within the other colour channels.

Post-calibration RGB Separation

It's possible that post-calibration, RGB Separation will be worse than pre-calibration, if the display has a gamut that is smaller than the target gamut. This is because the calibration process will have to deliberately introduce cross-coupling to accurately calibrate the display within the available gamut.

RGB Separation Pre-cal
RGB Separation Post-cal

Note: For the RGB Separation graph to plot and make valid sense the profile must have the same patches within the Primary RGB patch sequences as within the Grey sequence.

RGB Balance

The RGB Balance tab changes the main display to show the profiled display's RGB Balance, which is the same as colour temperature. The graph shows the RGB channels compared to the target colour space.

RGB Balance
(Return To Display Profile Menu)

Delta-E

The Delta-E tab changes the main display to show the profiled display's grey scale Delta-E accuracy, which is the combination of Gamma and RGB Balance. The black line on the graph defines the JND threshold (Just Noticeable Difference), which is a perceptual limit of 2.3. Above this value colour difference are visual, below not so. The green line is Delta-E 1976 (standard Delta-E), and the blue line is Delta-E 2000.

Delta-E
(Return To Display Profile Menu)

Delta-E Distribution

The dE Dist tab changes the main display to show the profiled display's Delta-E Distribution accuracy for all the measured points within the profile. The graphs show percentage in the vertical axis, and Delta-E in 0.5 step increments in the horizontal, so the more 'left and high' the graphs is, the better the result. The green line is Delta-E 1976 (standard Delta-E), and the blue line is Delta-E 2000.

Delta-E
(Return To Display Profile Menu)

Luminance Thermometer

The Luminance Thermometer display provides feedback on the measured brightness of the display, showing the result as nits (cd/m2).
(Return To Display Profile Menu)

Colour Standard Target Values

The Colour Standard Target Selection drop-down menu selects the target colour space from a selection of pre-sets spaces, as well as any user saved colour spaces. The colour space options are:

  • DCI P3
  • Rec601 NTSC (this is an old and unused colour space - included just for historical reasons)
  • Rec601 EBU (the present SD PAL standard)
  • Rec601 RP145 (the present SD NTSC standard)
  • Rec709 (the most common colour space in use today)
  • EBU TEC3320 (the same gamut as Rec709, with a 2.35 gamma)
  • sRGB (the main web standard)
  • DCI XYZ (the DCI projection standard)
  • ACES
  • ITU-R BT.1886 (This is replacing Rec709)
  • UHD Rec2020
  • ST2084 (PQ based HDR)
  • BBC HDR
  • Philips HDR
  • DICOM (Medical display calibration)
  • Vision Print Stock
  • Premier Print Stock
  • Fuji Print Stock
  • *Any User Generated profiles

As each colour space is selected the CIE diagram shows the colour coordinates, including primary and secondary, and the gamut profile.
(Return To Display Profile Menu)

Luminance Detail

The Luminance Detail display shows the Minimum and Maximum measured values, in nits (cd/m2), plus the Contrast Ratio of the display, assuming a valid black level measurement has been possible to read.
(Return To Display Profile Menu)

Gamut Triangle Level

The Gamut Triangle Level drop-down menu allows the measured Gamut Triangle to be displayed for each available matched RGB level within the profile.

By selecting the drop-down item (clicking on the value displayed) the keyboard up/down arrows can be used to animate through the available levels.

Gamut Triangle
(Return To Display Profile Menu)

Filters - Grey Scale

The Grey Scale filter option alters the graph data shown on the CIE graphs, toggling on/off the Grey Scale plots.
(Return To Display Profile Menu)

Filters - Primary Colours

The Secondary Colours filter option alters the graph data shown on the CIE graphs, toggling on/off the Primary Colour plots.
(Return To Display Profile Menu)

Filters - Primary Colours

The Primary Colours Filter option alters the graph data shown on the CIE graphs, toggling on/off the Secondary Colour plots.
(Return To Display Profile Menu)

Filters - Others

The Others Filter option alters the graph data shown on the CIE graphs, toggling on/off all the remaining colour plots - those that are not Grey Scale, Primary, or Secondary colours.
(Return To Display Profile Menu)

Stimulus Levels

The Stimulus Level drop-down menu allows the displayed points to be restricted to just points that include R, or G, or B values of the selected stimulus value.

By selecting the drop-down item (clicking on the value displayed) the keyboard up/down arrows can be used to animate through the available levels.

Stimulus levels
(Return To Display Profile Menu)

Delta-E

The Delta-E drop-down menu allows the displayed points to be restricted to just points that are included within the selected Delta-E range. This is a great help in understanding where a display is good or poor with respect to the desired calibration.

By selecting the drop-down item (clicking on the value displayed) the keyboard up/down arrows can be used to animate through the available levels.

The two radio buttons select the desired Delta-E formula to be used.

Delta-E
(Return To Display Profile Menu)


Custom Filter

The Custom Filters option enables a user to define what points should be plotted on the CIE diagrams, making it easier to assess the points of interest.

For information on the various Operators available when defining the filtering see: Custom Filter Operators

Custom Filters
(Return To Display Profile Menu)

Custom Filters

The Custom Filters are a very powerful tool to help define the exact points that are displayed on the CIR charts.

For example, using the following filter would 'hide' any Grey Scale and Primary colour points on the CIE graph that have values below 0.05, out of the range of 0-1 for the input patch triplet value.

GREY(R,G,B) || PRI(R,G,B), R > 0.05 || G > 0.05 || B > 0.05

And to add Secondaries:

GREY(R,G,B) || PRI(R,G,B) || SEC(R,G,B), R > 0.05 || G > 0.05 || B > 0.05
Export to PDF

The Export to PDF option will export a PDF of the desired graphs and data for the presently selected profile, using the 'display filter' settings within the Display Profile menu to define what data is shown on each graph where applicable.

The PDF report can be personalised using the provided options, including company name and logo, as well as selecting which graphs and data to display within the report.

Export to PDF

After filling in the required additional information a PDF file will be exported when the 'OK' button is pressed.

Export to PDF
(Return To Display Profile Menu)

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