Re: [Linux-fbdev-devel] setcolreg vs. 565

[Michel <mic...@ii...>]

On Fri, 2001-11-23 at 22:09, Petr Vandrovec wrote:
> On 23 Nov 01 at 20:33, Michel D=E4nzer wrote:
>=20
> > On Fri, 2001-11-23 at 20:36, Petr Vandrovec wrote:
> > >=20
> > > > >Except that you can't change gamma, or am I on the wrong track her=
e?
> > >=20
> > > No. But it is much better to provide _global_ gamma correction settin=
g,
> > > so you can then apply this gamma table even to 8bit palettized mode,
> > > and even without app knowledge.
> >=20
> > That would require a new API, no?
>=20
> Yes.
> =20
> > Right now, apps use the colormap for this, and I'd hate to prevent them
> > from doing so just because it's hard to get right.
>=20
> There is no gamma API now. There is just an API to set RAMDAC, which
> can be used as gamma in directcolor mode. But just in directcolor,
> you cannot use it in palettized modes, although it is possible (as
> in palettized mode RAMDAC is used in completely different way and it
> cannot be used itself as gamma correction ramp), and also consoles will=20
> not use this gamma - only X can do (if they do...).

We do, for both directcolor and pseudocolor. :)


--=20
Earthling Michel D=E4nzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member   /  CS student, Free Software enthusiast