Re: [Devel] Gamma correction for anti-aliasing

[Vincent Caron]

On Sat, 2002-06-08 at 19:12, Keith Packard wrote:
> FreeType can already do this; use a matrix to expand the outline by a 
> factor of three and then pick off the R G and B elements separately.  Note 
> that you'll want to use a filter to reduce the contrast among the 
> sub-pixel elements to reduce color fringing.  Examples of what this looks 
> like can be see at:
> 
>       http://www.xfree86.org/~keithp/render/clear.html
> 
> Reducing the color fringing also reduces the effective improvement in 
> horizontal resolution; I think it gives about a factor of two or so with 
> the filter I use.

Thanks very much for these infos, I was missing important points. I
actually already saw that page but I forgot it, shame on me :). It's
however understood that the ClearType trick is only about oversampling
along one direction as far as FreeType is concerned. I'll have a more
careful look at Xft now.