Lumagen User Guide
The range of Lumagen Radiance LUT boxes work with a combination of 1D and 3D LUTs for accurate display calibration when used in conjunction with LightSpace CMS
The Lumagen Radiance LUT boxes are HDMI input/output devices, ideal for use with any form of display that uses HDMI or DVI-D connections, making it a perfect for home theatre operations where precise colour management is required.
Depending on the specific Radiance box being used, connections include HDMI in, HDMI out, a Serial connection (requiring a USB to Serial converter), or direct USD port, for LUT uploading.
Lumagen 3D LUts
The Lumagen LUT Boxes enable 1D and 3D calibration LUTs generated via LightSpace CMS to be uploaded into one of a selection of preset LUT locations, selectable via a user infrared remote control.
When combined with LightSpace CMS the Lumagen Radiance LUT Boxes provide accurate colour management and calibration capabilities.
The size of the 3D LUT that is uploaded depends on the Lumagen LUT box being used, and LightSpace interrogates the Lumagen and uploads the correct format.
For further information on the capabilities of the Lumagen Radiance LUT Boxes see Lumagen website.
Instructions for performing LightSpace CMS display calibration with Lumagen Radiance LUT Boxes will vary depending on the specific Radiance LUT box being used, but the following information should cover most configurations.
First, make sure the Lumagen box in use has the latest firmware installed by visiting the Lumagen Software Update page.
Note: If there are issues communicating with the Lumagen perform a Factory Reset, as it is likely the box has been set to an non-standard configuration, such as Termination sequence character, or Echo response.
Set the Lumagen Box to Unity
Before starting calibration work ensure the Lumagen box is transparent when no calibration LUTs are loaded.
- Using the Lumagen remote control re-set to factory default
(Either use the 'Factory Reset option, or via the remote use 'Menu/0999', save the new settings and re-boot the Lumagen)
- Connect the Lumagen to the LightSpace PC via a USB or USB to Serial cable
- Select File/Upload from LightSpace, and select the active COM port
- Select 'Null Cube' (if it is not automatically selected) and 'Upload'
(This will reset both the 1D and 3D LUTs to unity)
- If there is no LUT active with LightSpace the NULL Cube option will be ticked and greyed-out, but is operational.
(As no other LUT is available the ONLY option is the NULL Cube)
The LUT Box is now set to unity, but may not yet be correctly configured.
When the 'Null Cube' tick box is used, all Lumagen settings may be nullified, not just the 1D and 3D LUTs. Should it be desired that settings other than the LUTs remain as set, upload a real Null/Bypass 3D LUT (generated via File/New), as that will only 'null' the 1D and 3D LUTs, as selected.
Note: should just the 1D or 3D LUTs require setting to Null/Unity, use the same File/New process to reset just the 1D or 3D LUTs as desired. Using the Null Cube option will always reset everything, regardless of the LUT upload selected.
Although the option is labeled 'Null Cube', an actual Cube (LUT) is not necessarily loaded into the display, depending on the display's capabilities/options. A 'reset' command may be issued, rather than an actual Cube file uploaded.
Check Lumagen configuration
The Radiance LUT Box may need to be configured correctly for the display in use, and the correct configuration will vary dependant on the Radiance being used. The following is based on the Radiance Mini, but the basic information will be viable (to different levels) for any Radiance box.
The basic configuration to check is:
Input / HDMI / Type: Auto(???)
Input / HDMI / Level: Video/PC
Input / HDMI / EDID: Passback/Default
Output / Styles / Stype ? / HDMI Format / Type: Level=Vid/PC
The check is to look for incorrect black/white levels caused by incorrect Radiance settings.
To check for the correct set-up the following tests can be used.
- Using a controlled video source display a black image
- Change the In/Out HDMI options in turn and check for accurate black levels
(A probe can be used to check black levels, as outlined below)
- Generate a 'File/New' LUT, and use 'Edit/LUT Manipulation/Gamma' and set to 2.0
(If the LightSpace license you have doesn't have the 'Edit/LUT Manipulation' option, use the LUT Image to make a similar gamma change via an external graphics program)
- Using a controlled video source display the Light Illusion BrightnessCal image
- Again, change the In/Out HDMI options in turn and test by uploading the Gamma Change LUT created above using the 1D+3D Upload option
- When the correct Radiance configuration is set the Gamma LUT will operate correctly, altering the image Gamma, with no change to zero black