[EMAIL PROTECTED] wrote:
Of course I had. Unfortunately with no results. The facts are, v4 has not changed anything on the interpretation. It just happens v2 didn't specify this behaviour. As a side effect, sRGB, AdobeRGB, CIERGB, AppleRGB, ColorMatchRGB and all workspaces implemented as display profiles are considered to be wrong.
I don't accept that. The spec. was ambiguous, but certain very widely accepted profiles (like sRGB) and CMMs (like Adobe) interpreted it in a way that worked perfectly well. Now V4 "clarifies" things (but not really, given the contradictions about what absolute intent is meant to be useful for), and makes the new profiles incompatible, reduces functionality, and causes lots of problems.
So, in order to get rid of all those issues, I've introduced the adaptation state function. At first I intended to use a separate absolute colorimetric intent, but this would create even more confusion to enduser, so, I think is better to keep a single intent numbered '3' for absolute and provide an additional function to control if the display should do a chromaticity match or behave in this weird ICC-absolute way. Maybe in a future this function would control incomplete states of adaptation. That would be good for softproofing in mixed environments, but would need to use an appearance model, so it is still rocket science right now.
Having thought it through, I would actually take the opposite approach. Leave the CMM "absolute colorimetric" behaviour backwards compatible with V2 (so that users and applications don't see any change between V2 and V4), and add a new "ICCV4absoluteColorimetric" intent for those who prefer the V4 behaviour. Graeme Gill. ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
