Don't merge this yet; one of the two patches should be committed.
Please try and see if anyone with retina sees any difference. Personally, I don't see any difference and the size decrease is very big, so I'd go with the 8-bit ones.
/CC @mdo @cvrebert
Losslessly compress images.
Before: 1,28 MB (1.351.880 bytes)
After: 1,27 MB (1.341.411 bytes)
4631b22
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Lossy compress the 2 new images.
Before: 538 KB (551.052 bytes)
After: 179 KB (183.296 bytes)
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