Hi,

Many questions in your mail, some of them, I think, can be answered without
entering in the technical details you ask for.

An ICC profile for the monitor provides a way to draw colors specified in a
colorimetric space. XYZ in this case. Absolute colorimetric intent, at
least the old v2-absolute, means to reproduce the colors "as is", without
any chromatic adaptation. Since absolute colorimetry, as defined by CIE is
not feasible because the monitor most times cannot reproduce the same
intensity, a sort of relative colorimetry, when chromacity is preserved is
used instead.
Remainings intens do include cromatic adaptation. The white balance you
mention is closely related to adaptation state. So to answer your question,
a profile doe not "push" any color, it just provides a way to represent
colors specified in the XYZ space. Is when you join two profiles in a
transform that you obtain a mapping and this mapping may "move" source RGB
codes to monitor RGB codes. The way how colors are moved depends on the
profiles and on the intents, but in general all colors may be affected.

Some of this is discussed in the tutorial. 

Regards
Marti
 

Original Message:
-----------------
From: János, Tóth F. janos...@mailbox.hu
Date: Tue, 18 Jan 2011 21:27:40 +0100
To: lcms-user@lists.sourceforge.net
Subject: [Lcms-user] Questions about rendering intents


Does the Absolute colorimetric rendering intent (when used with XYZ-LUT
target profiles) correct the white balance (across the whole luminance range
and for every mixed colors*) or adjusts the white point only (and push every
colors into that direction; or the grays only)?

I can not describe it properly (language barrier), so here is an example: If
a profiled RGB display behaves like this:
100, 100, 100 - reddish gray
150, 150, 150 - bluish gray
200, 200, 200 - greenish gray
256, 256, 256 - reddish gray
Then will all of these colors be compensated to get closer to the "perfect
gray" (with a color temperature of the source profile) and provide properly
mixed colors (grays and "multidimensional"*) ; or will all of these colors
be pushed into the cyan direction because the white point (at the peak RGB
values) was reddish (and that applies for every mixed colors*)?
And how does it applies for the mixed colors? Will a greenish magenta be
corrected to "perfect magenta" (according to the source profile*) or will it
be more bluish or simply pushed closer to cyan?

*If they covered by the target gamut...


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