On Friday 17 March 2006 23:16, Timothy Miller wrote: > On 3/17/06, James Richard Tyrer <[EMAIL PROTECTED]> wrote: > > Timothy Miller wrote: > > > On 3/17/06, James Richard Tyrer <[EMAIL PROTECTED]> wrote: > > > > Tech Source and plenty of others have been doing it for ages with > > > medical LCD displays at 60Hz. > > > > Interesting but ... I think that gamma correction/color matching > > software works by loading a palate.
Well, the standard X way of adjusting your gamma settings is through XGamma. The X server queries the monitor for its current gamma setting as well at startup. The gamma value is just a triplet of floats, one for the gamma value for each colour. I think that the ATI cards use a small (8-16 entry) lookup table, and the RAMDAC does linear interpolation between these points to generate the final conversion curve. > > > One of the design requirements is that OGA should be very good > > > for 90% or more of desktop users. Very few are going to be > > > overly concerned about gamma correction at all, let alone how > > > many bits of precision on the DAC. > > > > Yes, you are correct on this. The only real market for fine > > control of gamma and color is pre-press color work. Perhaps most > > of those people still use Macs. :-) > > Yes, but wouldn't we like them to all move over to Linux? :) Also, different platforms have different gamma standards. Mac monitors do gamma 1.5 I think, while on the PC the standard is more like 1.8, and sRGB is 2.2. And if you want good antialiasing, having good gamma correction is a big help. Digital cameras are everywhere now, and people edit and print their photos at home. It would be nice if what they see on screen is a decent preview of what will come out of the printer, and for that, you need at least half decent gamma settings. Windows has had built-in support for device profiles and everything since 98 or so. It's time the open desktop catches up. Lourens PS: will get back to the website soon, I caught the flu and I haven't quite recovered yet.
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