Legacy ImageMagick Discussions Archive

Cool, thanks fmw42. Your code gives similar results to Glen's recommendation.

exec('convert old.png ( -channel A -threshold 60% ) -dither FloydSteinberg -colors 255 new.png');

Both will suffice.

Also, just wanted to say that the ImageMagick team has done some really great work. Really ...

fmw42 i did tinker with -alpha off, -alpha on

#2 exec('convert old.png -alpha off -dither FloydSteinberg -alpha on -colors 255 new.png');
#3 exec('convert old.png -alpha off -dither FloydSteinberg -colors 255 -alpha on new.png');

Perhaps I implemented it in a incorrect way? Could you please ...

Thanks Glen!
I appreciate the recommendation. It sucks that you could confirm the artifacts too, i was hoping that it was just me... Just in case it was just me I though I would post on the forum and perhaps resolve the issue but otherwise I'm not too worried. Would you know why this is happening?

First off, ImageMagick is awesome. Thanks to the people out there that put it together. Great work!

I'm trying to convert a png32 file down to 256 colours/png8, preserve transparency/alpha, and dither BUT I keep on getting some weird artifacts OR a black background.
The closest I could get to ...