I mentioned earlier that some of the crystal set contains icons saved at 16bits per sample, and that many icons would benefit from some lossy tweaking. Well here's an example: /res/commandimagelist/lc_linewidth.png
(Also used for lc_formatline.png & lc_fillstyle.png).
Original was 1,860kb. After lossless optimization (only 'advdef' can handle 16bps), compressed to 1,658kb (84%). Reducing to 8bps (32bpp) and some minor tweaks to remove a few unnecessary palette colours (lossy+losslesss), gives us a final file of 856kb (46%).
Running various compression methods gets us so far, but the best approach is for the icon designers to consider efficiency at the production stage. The increasing trend for blitting png icons from an svg (or other vector file), moves the designer even further away from pixel pushing and the ability to hand optimize a file. Maybe this is a dying craft only for the true geeks?
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