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by PetahNZ 2326 days ago
Do you have any examples of zipped bmp's compared to png. Seem strange if that was indeed better.
2 comments
Dylan16807 2325 days ago
It shouldn't be that surprising. PNG has a maximum window size of 32KB. That means you could use a small set of identical tiles to make an image, and PNG would have to store a new copy every row, because the previous row is out of range.
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clarry 2326 days ago
Well I just took a screenshot and tried it. BMP: 6MB. lzma-compressed bmp: 75K. PNG through optipng and pngcrush: 178k.

Not very surprising imho. PNG was never a strong compression format to begin with.

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