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Re: Help with X on iBook?

On Fri, 16 Mar 2001, Kin Chung wrote:
> >From: Sven LUTHER <luther@dpt-info.u-strasbg.fr>
> >On Fri, Mar 16, 2001 at 12:51:50PM +0100, Geert Uytterhoeven wrote:
> > > On Fri, 16 Mar 2001, Sven LUTHER wrote:
> > > > should work fine. Anyway, we never trully use 32 depth, since this is 
> >just 24
> > > > depth + 8bit alpha channel. I think some board support a color depth 
> >of 30
> > > > (10bit per component), or maybe even 36, but never 32.
> > >
> > > Hmm, I'm not that sure there are no RGB11/11/10 or RGB10/12/10 boards...
> >
> >Well, in any case, i can assure you there are non such in an iBook.
> That's for sure.  The best that the chip can do is 8x8x8 with 8 bits
> pad to speed-up graphics handling.  Mind you, I can't see much of a
> need for RGB 11/11/10 or RGB 10/12/10.  Seems like overkill to me,
> given that the reported human sensitivity is only about 100 shades.
> Of course, one can easily find better uses for 8 bits rather than
> wasting them as padding (eg special effects) :-p.

Note that human sensitivity is non-linear. Monitors are also non-linear. The
net effect is that you may need much more linear levels to provide enough color
resolution for the human eye.

If only graphics cards and monitors would work with L*a*b* instead of RGB, we
wouldn't suffer from this problem :-)



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

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