Software for creating PNG 8bit transparent images?

Question

I\'m looking for software to create PNG8 format transparent images as per this article.

NOTE: I need a linux solution myself, but please submit answ

Answer 1

Microsoft Windows: Ultimate Paint (freeware and shareware versions are available).

Both versions can save as an 8 bit transparent PNG image.

It can also save as a 4 bit PNG (16 colours). This cuts the file size in half compared to 8 bit.

Input formats include BMP, GIF, ICO, JPG/JPEG and PNG.

The freeware edition of Ultimate Paint Standard 2.88 LE can be downloaded directly from http://www.ultimatepaint.com/up.zip (1.7 MB).

Answer 2

For Mac: ImageOptim and ImageAlpha are GUIs that run pngcrush, pngquant, and various other normally command-line compression utilities. http://pngmini.com/