On Thu, 2009-03-26 at 11:51 +0100, Roberto Ragusa wrote: > Just a thought: do I remember correctly that the color filter is just a > simple y(0)=(x(-1)+x(0)+x(1))/3 on the subpixels? Did anyone consider that > R, G and B have different brightness to the human eye and should be weighted > more smartly? Everyone's favorite self-aggrandizing lunatic Steve Gibson has this algorithm: http://www.grc.com/cttech.htm Which looks quite good to me and makes a lot of sense. But playing with his little applet I really don't see the advantage of the second pass, the first filter pass looks just fine to me, I can hardly see the difference the second pass makes, it just looks very slightly blurrier. Note that his applet only seems to be working with un-antialiased text with good hinting, which probably makes a difference. If your underlying font rendering looks like crap, fringe filtering isn't going to help it any. Garbage in garbage out. I have no idea how Gibson's algorithm relates to any patents. Gibson doesn't seem to have any, but a lot of patents seem to reference his page...
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