Photogs, graphic artists-are you using PNG?

[M A V I C]

PNG doesn't support CMYK. So for print, it's a non-option. Just because it's PNG doesn't mean it's lossless. It can be lossless, but it depends on the application and the encoding used. I think assuming because it's PNG it's lossless is very dangerous. Compare PNGs from Photoshop saved via Save as... vs Save for web and you'll see a difference (at least in file size.)

For most computers anymore, there's no real reason to use interlacing.

mikebw wrote: One thing that you might not know is that while GIF supported transparency it was only 1 bit (on or off) whereas PNG provides 8 bits of transparency information.

aka "alpha transparency"