I know there are different kind of CLUT formats,
all dealing the 3D to 2D transformation in their respective way
(the 2 most-spreaded are offered in G’MIC’s CLUT functions: .cube and HaldCLUT).
But I haven’t found any information about other formats anywhere.
The .cube format obviously is ASCII and by that kind of unusable if larger.
The HaldCLUT is descibed at it’s author’s site having many advantages.
XnViewMP contains several cluts, and also 2 identity cluts
in HCLUT, and also in “RGB LUT” format:
Due to the positioning of the entries the “RGB LUT” is
more than 3 times smaller than the HCLUT,
and can be zip compressed by factor 10, instead of 2 for HCLUT.
As very detailed/ large CLUTs are a problem, the drastic effect
of the order of the entries should be relevant.
Are the any information about CLUT formats?
Have these “RGB LUTs” as much advantages as HCLUTs?