Hello there, I have a strange behaviour with xcalib vs dispwin when loading LUT. They do not seem to read the vcgtag the same way, depending of the profile. Let me try to explain... I attached a profile coming with xcalib package. This profile has a 2.2 gamma. When loaded with xcalib, it does not change anything to my uncalibrated screen (no previous profile loaded). But when loaded with dispwin, the screen becomes very bright. *But*, when I load an Argyll generated profile (also attached), they both give the same result! I had a look in the profiles, with iccexamin, and I saw differences; it seems that the vcgtag is linear in Argyll generated profile, even if it is a 2.2 gamma profile. But I also see that the [rgb]TRC tags are, in both cases, the same (2.2 gamma curved). Graeme, can you explain me how exaclty dispwin loads LUT? Do you know why xcalib does not give the same results only on its sample file? Thanks, -- Frédéric http://www.gbiloba.org