Re: Gamma, AA and Fonts

  Hi Simon,

  I posted a patch to this list for gamma correct compositing:

  http://www.xfree86.org/pipermail/render/2001-December/001502.html

  Unfortunately, I haven't had time to try it myself.  I was hoping
someone like you would have more time than myself. :)

> I browsed through several discussions of this topic on this list, but
> AFAIK there is generally seen no need to apply gamma correction to
> antialiased fonts.

  I think it's generally understood that any time you interpolate colour
you must take gamma into account.

> AFAIK there is no way to get a display's gamma from X (which could be
> known through configfile or maybe DDC), which IMHO is a design flaw.
> Microsoft made the sRGB standard which provides a default of
> gamma=2.2; things are a little more complicated anyway, but a loose
> match is ok for antialiasing issues.

  The standard gamma of 2.2 is pretty prevalent.  I was told that the
gamma returned by most monitors isn't correct anyway.  I agree that X
should provide some way of querying a global display gamma value so we
can use it for image processing (and compositing).

  Yes, I do intend to do more research on doing a proper patch etc, but
school has been alot of work this term.  Next month should be better.

-- 
Billy Biggs
[email protected]
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