Comment 12 for bug 170650

#11:I'd say the bug is that people don't accept rgba png :)

nyway, I'vz tackled this bug and commited to rev 15131.

Attached is a screenshot of the interface (it can change). I did Grayscale/GA/RGB/RGBA choice + bit depth choice, interlacing, pHYs dpi, and compression choice.

Dithering is not a PNG option, and might be done via cairo, but I'm not sure how for the moment, so it's not there.