[EMAIL PROTECTED] writes: > An LCD will be rather non-linear, and a CRT certainly is (it follows a > power law). But the CCD in a camera is absolutely linear.
That's good to know; I had always wondered if there were interactions with profiles and exposure compensation in raw processing. That explains why the "color matrices" are being used these days instead of profiles. It seems really you'd want a different matrix for each illuminant, and in ufraw at least this is decomposed into a WB correction and a single matrix. That probably works because the off-diagonal elements are small. > If you do see non-linearities, in my experience they come from either > internal camera firmware processing (hopefully you can turn this off, > or look up exactly what the firmware is doing in the docs) or from > scatter in the optics. IMO you don't want to include either of these > in your profile. I agree that scattering shouldn't be included, and as I understand profiles they are about a single input color representation being mapped to a color in another space, so there would be no way to account for it anyway. Thanks for the comments - I think I understand things a lot better now. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
