On Monday 01 January 2007 13:26, Stefan Döhla wrote: > > xcalib should change the grafics card gamma table as described in the > > vcgt tag. I would guess xcalib is not supporting the parametric entry > > (~2.2) in opposite to the most often used curves. > > Hm, that's not right. There's just the system gamma which is used in > xcalib and not used in dispwin. Whether it's right or not: xcalib went > the way of the other calibration loaders, dispwin the "clear" way. > > >> *But*, when I load an Argyll generated profile (also attached), they > >> both give the same result! > > > > The argyll profile uses a curved vcgt tag. > > Right, the gamma profiles use the VideoCardGammaFormula whereas the > Argyll-profile uses the VideoCardGammaTable. The table leaves no > space for misinterpretation - wherease the formula does ... Thanks to all for the explanation; I understand, now. -- Frédéric http://www.gbiloba.org