On 2003-09-30 13:28:18 +0200, Michel Dänzer wrote: > This does indeed sound like software, as the hardware affects the > whole screen. The X gamma correction uses the hardware though.
Do you mean the -gamma option of XFree86? I get very similar results to xgamma with it (except that it affects the whole screen instead of some images only). > > In other words, here what seems to happen: Each RGB color is > > indexed by 256 values. Instead of doing a continuous gamma > > correction on these 256 values (as output of the graphic card), it > > seems that the X server does a mapping 256 values -> 256 values > > for some pixels, i.e. as if the pixel values were different. > > Right. The mapping is calculated using gamma curves with xgamma and > the X server -gamma option, and they should both give the same > result with the same values, otherwise there's a bug somewhere. If the hardware gamma correction does a 256 values -> 256 values mapping, then the problem is here. Why not more than 256 values (or something analogic) for the output? -- Vincent Lefèvre <[EMAIL PROTECTED]> - Web: <http://www.vinc17.org/> - 100% validated (X)HTML - Acorn Risc PC, Yellow Pig 17, Championnat International des Jeux Mathématiques et Logiques, TETRHEX, etc. Work: CR INRIA - computer arithmetic / SPACES project at LORIA
