[oofabz]

If anyone is interested in lossy PNG compression, please check out my project at https://github.com/foobaz/pngloss

It doesn't compress as well as JPEG or other formats that are designed to be lossy. But if you need PNG for some reason like alpha channel or application requirements, or if your image is particularly well-suited to my compression algorithm, it might be a good choice. For many images it does compare favorably to an 8-bit indexed PNG.

[riidom]

Nice! For images that lean well to indexing, I always use png, it's amazingly small. How hard (for an amateur) would it be to plug your algorithm into GIMP? But should have live preview, because judging by your example images, there is a bit of trying involved.

[jart]

I got an error with your online form :'(