Re: Step-by-step through a CLUT...
Re: Step-by-step through a CLUT...
- Subject: Re: Step-by-step through a CLUT...
- From: Graeme Gill <email@hidden>
- Date: Thu, 18 Oct 2007 00:39:12 +1000
Mark wrote:
I would just like to add that I read the LCMS tutorial, there LUT
stages are explained as:
[Mat] -> [L1] -> [Mat3] -> [Ofs3] -> [L3] -> [CLUT] -> [L4] ->
[Mat4] -> [Ofs4] -> [L2]
Mat{n} are matrices of 3x3
Ofs{n} are offsets
CLUT is a multidimensional LUT table
Interestingly when I look at a profile in ColorSync, for an A2Bx tag it
shows only the tabs Matrix, In Curves, Table, Out Curves. Why won't
ColorSync display the additional Matrixes and 1d LUTs?
Perhaps the LCMS tutorial is referring to it's complete internal
path, where it is dealing with PCS conversion (Lab <-> XYZ), and/or
absolute intent conversion, and/or it is showing ICCV4 profiles
support, while colorsync is showing the processing for just a V2 lut16
profile table ?
Graeme Gill.
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