Better Image Optimization by Restricting the Color Index – Eric’s Archived Thoughts
A great little mini case-study from Eric—if you’re exporting transparent PNGs from a graphic design tool, double-check the colour-depth settings!
I’d been saving the PNGs with no bit depth restrictions, meaning the color table was holding space for 224 colors. That’s… a lot of colors, roughly 224 of which I wasn’t actually using.