Re: Step-by-step through a CLUT...
Re: Step-by-step through a CLUT...
- Subject: Re: Step-by-step through a CLUT...
- From: Mark <email@hidden>
- Date: Wed, 17 Oct 2007 16:12:01 +0200
On 17.10.2007, at 15:58, Mark wrote:
I've read the ICC specs (v2 and v4) and I see how the n-dimensional
LUTs are saved in a profile. But I've so far not been able to find
any information on the web how such a CLUT is evaluated so that say
incoming RGB turns into the profile's PCS.
As I've learned from other posts, most CMSs will actually combine
the transforms from to profiles into ONE transform, so things are
executed faster. But still, I would like to know in detail which
operations are really needed just to do one transform to or from PCS.
Can someone here give me a pointer where I might find such
information?
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?
Mark
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