LightDensity XYZ User Manual

LightDensity XYZ is a self-installing, stand alone, Windows application, designed to enable conversion of film density data into XYZ profiles for use with LightSpace CMS, enabling the generation of accurate LUT for film projection emulation.

LightDensity XYZ has been used to generate a lot of the Film Emulation 'Look' LUTs offered for sale by many different companies, in conjunction with Light Illusion's Film Profiling Service.


Initial Operation

LightDensity XYZ

When installed and started the program will inform you of its license status. If the program has been purchased, and is not being used just for evaluation, follow the registration instructions.

For demo purposes, continue without licensing, which will give limited operational usage to allow the various capabilities to be explored. During demo use the system will not export profiles, and the profile data generated will be 'unity' data only.

Registration details can be performed at any time by sending the PC MAC address as instructed.


Data Generation

Before using LightDensity you will need to generate both film negative and print film density reading data, using a densitometer such as the X-Rite 310t, or Light Illusion's own SpecTD densitometer. This data generated needs to be in simple space delimited form, which can be generated manually, or fully automated if using a 310t or SpecTD densitometer.

If using an alternative densitometer simply format the output density information into a space delimited form - which is a .txt file with 3 columns of floating point numbers.

0.0445 0.0310 0.0480
0.2235 0.0270 0.0410
0.4115 0.0315 0.0435
0.6095 0.0370 0.0420
...

All files should have the same number of rows. with each row lining up with its original 'Code Value', which is held in the codeValue.txt file. The supplied example codeValue.txt file is matched to the downloadable Film Calibration Flats.


Data Loading

There are three forms of data that need to be loaded into LightDensity to enable the generation of an XYZ profile. These are loaded via the three main program tabs - Code Values; Recorder StatusM (film negative); Print StatusA.

LightDensity XYZ

Use the 'Browse' buttons within each tab page to load the required data files. Example data can be found in the main program installation location, usually: C:\Program Files\VFXC\LightDensity\examples.

With the data loaded, and if required (which is not usually necessary) the 'scale' and 'Offset' values can be adjusted to match the data range requirements.

Selecting the 'Process Profile' button will then generate an XYZ profile based on the loaded data files.

Select the 'Save Profile' button to save the profile. After saving the profile can me imported into LightSpace CMS to enable the generation of accurate film projection LUTs for use in any DI grading application.

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