On Mon, 2002-10-28 at 17:55, Marc Wilson wrote: > On Sun, Oct 27, 2002 at 11:14:37PM -0500, [EMAIL PROTECTED] wrote: > > On Sun, Oct 27, 2002 at 07:07:15PM -0800, Marc Wilson wrote: > > > I always had the problem with my G450 and later with my G550 that X > > > wouldn't set the gamma the same on both heads, although it claimed that it > > > was according to the log. The monitors were the same make and model, and > > > the difference was distinct and annoying. > > > > > > OTOH, xgamma was always quite willing to set the gamma on the heads > > > separately, and I was also able to specify specific gamma settings for > > > each > > > monitor in XF86Config-4 and have them take effect. > > > > In that case I'm confused. Has there been a regression since XFree86 > > 4.1 or not? > > I should clarify... > > When I was still using the G450/G550, X would claim that it was setting the > gamma on the two monitors identically. Anyone who looked at them, though, > would be able to tell that they were wildly different. > > I used xgamma (at first) in $HOME/.xsession, and later manipulating > XF86Config-4 directly, to reduce the gamma on the second monitor, like so: > > Section "Monitor" > Identifier "Viewsonic PF790" > HorizSync 30-97 > VertRefresh 50-180 > Option "DPMS" "Yes" > Gamma 0.8 0.8 1.15 > EndSection > > This was the only way I could make the two of them balance. I always > chalked it up to just hardware differences in the respective video outputs > (ie they had different ideas of what gamma 1.0 meant) and got on with > things. > > I haven't run either of my Matrox cards on XF 4.2.x... it's a nVidia world > in my box now (I wouldn't have, but they were free). > > Sorry for any confusion I may have introduced. I think I was trying to > point out that even though they weren't being set the same (and X claimed > they were), there was still individual control on both heads.
Every monitor has a characteristic color response curve; that's one thing one can compensate for using xgamma. You can't expect the same values to produce the same result on different monitors. -- Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer XFree86 and DRI project member / CS student, Free Software enthusiast
