Lots of png format information from Kornel Lesiński, creator of ImageOptim.
You don’t have to read such a long article to use PNG properly. Quick version:
- PNG works since IE4. If you’re still using GIF, you’re wasting bandwidth.
- Use 256-color PNGs.
- Avoid 24-bit PNGs. Use pngquant if you want to have a cake and eat it too.
- Use a PNG optimizer. You’ll get smaller files and avoid some pitfalls.
