Camera LUT Options
Working with Camera Options for Look LUT generation.
The 'Camera' option within the Colour Space options enables the use of Camera data, as provided by the supported camera manufacturers, to generate Conversion and Look LUTs for any Destination colour space. The Camera Options are available with LightSpace XPT and PRO.
Camera Technical & Look LUTs
The Camera Settings options enable the generation, previewing, and analysis of Look and Technical Conversion LUTs for a range of digital cinematography cameras, specifically those that shoot and capture Log and Wide Colour Gamut.
The LUTs generated within LightSpace CMS are 'technically' correct, based on the camera data provided by various manufacturers, which means they will often be 'different' from the Look LUTs provided by the same manufacturers, as the manufacturer LUTs often contain undocumented LUT manipulations to try to 'improve' the look of the final image.
This undocumented manipulation of manufacturer LUTs is not 'wrong', nor a cheat, but does mean it can be difficult to assess the true image capture capabilities of any given camera without using technically correct LUTs, as can be generated via the LightSpace CMS Camera Settings option.
Generating camera to camera technical conversion LUTs can be particularly telling over the true underlying capabilities of different cameras.
The LightSpace CMS Camera options uses colour and gamma data provided by the various camera manufacturers, with various options available depending on the camera format and value manipulations specified by the manufacturer.
When the Camera option is first selected tabs for the different camera formats, as well as a default Rec709 camera, are available. Each tab provides various options for the different camera formats, as specified by the different camera manufacturers.
Peak Luminance Mapping sets the clip point for the generated LUT, clipping all over-range data.
This control functions as an exposure control, so 100% would be the nominal value for correctly exposed footage displayed on a standard monitor - 50% would be used for footage exposed 1 stop under, and 200% for 1 stop over, with any value used for creative Look LUT generation.
Set Black sets the expected black point (level) for the camera output, which is used to correctly calculate the Transfer Function during generation of the LUT. Note: this is not setting the black point of the generated LUT.
Set White sets the expected white point (level) for the camera output, which is used to correctly calculate the Transfer Function during generation of the LUT. Note: this is not setting the white point of the generated LUT.
Note: if a LUT needs to perform rescaling, say from Video Range to Data, the LUT Manipulation Tools should be used.
Transfer Function selects the desired transfer curve from a drop-down list defined by the camera manufacturer. Different camera formats have different options. The selected Transfer Function also sets the maximum Peak Luma Mapping, based on the selected Set White value.
Gamut selects the desired camera Gamut from a drop-down list defined by the camera manufacturer. Different camera formats have different options.
Using Camera Settings
Camera Settings can be used as 'Source' within Convert Colour Space, with the display's colour space selected as Destination, which will generated a Look LUT to take captured footage and display it in the correct colour space for the display being used.
Alternatively, using 'Destination' for the Camera Settings, with Source as a standard colour space, will generate a LUT to convert an image from the defined colour space back into the camera's colour space.
In the above example, a Look LUT will be generated for Red camera footage shot Red Log3G10, clipping white at 100%, with Gamut set for RedWideGamutRGB, for display on a standard Rec709 display.
From the above, it should be obvious that using different Camera Settings for Source and Destination will generate a Conversion LUT to transform from one camera's colour space and transfer function to another camera.