Color Measurement
and Analysis
CT&A RGB vs RGB
custom RGB space
A custom RGB space can be defined by specifying the illuminant coordinates, the red, green and blue primaries, and the gamma function.
You can export your custom RGB space as an ICC profile. This profile can be assigned to an image using image editing programs that
support profile embedding, such as Photoshop. It can also be assigned to a color list in BabelColor's PatchTool or used to convert a color list
with PatchTool's Gamut Tools. You can also export all the custom data as well as the XYZ-to-RGB and RGB-to-XYZ matrices coefficients to a
spreadsheet.
A D-series or blackbody illuminant can be
defined simply by entering the source
temperature, in kelvin.
Gamma can be defined by a single parameter
or a two segment function with a slope for the
linear portion, a transition, an offset, and a
gamma value. The screenshot below contains
the gamma parameters of the eciRGB_v2
space, also called L*, i.e. L-star. The L* tone
response curve can, in effect, be exactly
defined by the same equation used for the
sRGB and NTSC spaces just by changing the
parameters' value.