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Texture File Formats and Sizes Comparison 

Filename JPEG Size GIF Size Original PNG Size gif2png PNG Size pnmtopng PNG size pngcrush PNG size
lino1 10956 7055 *16008 8325 8196 6753
doggie 9897 24605 **89022 22688 22583 22619
fog ---- ---- 26732 ---- 16221 16231
cfade ---- ---- *15735 ---- ***9789 7565
buttfly ---- 4367 ---- 4185 4072 4112
JPEGs saved from Photoshop with low quality, Original PNGs with standard Photoshop options, GIFs are 8-bit palettes
(*) original was interlaced PNG; comparison images are non-interlaced
(**) original was 24-bit RGB PNG; comparison images converted from 8-bit GIF
(***) converted by pnmtopng to an 8-bit PNG with a 250-entry RGBA palette

Thanks to Greg Roelofs for making the chart, and for doing better compression on PNG files