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... -------------------------------------------------------------------- mail2web LIVE Free email based on Microsoft® Exchange technology - http://link.mail2web.com/LIVE ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
