Re:Firefox 4 is here
by henrikschroder on Tuesday March 22, 2011 @11:25AM
(#2354792)
Cleartype uses subpixel rendering as well, I'm not so sure you can achieve that by simply down-sampling a larger render.
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Actually, while it will do that it also tries to shift edges to lie on pixel boundaries when possible. This distortion can make edges look clearer though it also looks brutal with certain type faces. Most people like whatever they are used to.