János, Tóth F. wrote: > - The Relative colorimetric and Preceptual intents won't correct my white > balance.
They won't, since they are white point relative. The assumption is that you (the viewer) are fully adapted to the white point. > - The Absolute colorimetric intent is often buggy (absolutely broken in > MPC-HC, unavailable with Adobe ACE and strange with Microsoft ICM). And > black compensation is usually unavailable with this intent. Unfortunately you are fighting against the stream of assumptions made by the ICC and system implementers. In ICC V4 for instance, there are no absolute colorimetric display profiles anymore, since the ICC have chosen to regard the display white point as the illuminant, and put it into the chromatic adaptation tag. So for V4 display profiles, absolute colorimetric == relative colorimetric. They are basically assuming that no one will ever want to do what you are trying to do. > I found the -u switch in the ArgyllCMS documentation. It creates an > "absolute" cLUT profile. Note that this only works for input profiles. So it will have no effect on display profiles (it makes no sense for output profiles). If you want to play with this idea, try using the -t or -T parameter to set the perceptual or saturation intent tables to an absolute rendering. (But note that you can't simultaneously select an absolute white point treatment in combination with specific gamut mapping). > My half-proven theory was that I can achieve significantly better results > when I skip the calibration (new VGAs, like my other one ---- a HD5850, > which is unable to send out 10 bit from the framebuffers (driver limit) ---- > may offer 10-bit effective LUT precision, but this older professional AMD > card offers only 8 bit LUT precision, while it can send out 10 bit/color > from the framebuffers ---> It's funny, I think...) The latter certainly seems pointless. Are you sure it really works works this way though ? I would guess that if you wanted to you could create a calibration using dispcal, and then apply it to the profile rather than DisplayLUTs during dispread, using a workflow similar to the printer "Workflow without native calibration capability", although there would be some manual steps involved (stripping the calibration info from the .ti1, applying the calibration curves to the .ti1 data. I might add another option to dispread to avoid these manual steps.). (I'll leave Marti to answer the lcms questions :-) Graeme Gill. ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
