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Re:Pixel Art Scaling Algorithms by ladon86 on Thursday December 23, 2010 @11:07AM (#2034780)
I've always liked these - the hq3x algorithm is stunning (scroll down on the linked page to see a good result).
Re:Pixel Art Scaling Algorithms by pornel on Thursday December 23, 2010 @02:24PM (#2035548)
I've tried[1] to use it to weasel-out from creating improved graphics for iPhone 4 display, but unfortunately it doesn't work well for graphics with anti-aliasing.

[1] https://github.com/pornel/rgba-hq2x