Legacy ImageMagick Discussions Archive

Ok, thanks for the fast help.

Actual PNG http://img.xrmb2.net/images/642919.png
Ah I see, yes it works with -alpha remove alone without specifying the background. So it is antialiased, but all pixels with alpha!=0 are simply ignored, I see. I'm not entirely sure if the default behavior should somehow be changed, e.g. a ...

I'm using

Version: ImageMagick 6.9.7-4 Q16 x86_64 20170114 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP
Delegates (built-in): bzlib djvu fftw fontconfig freetype jbig jng jp2 ...

I have a test png which when converted to jpg results in jagged lines but only for rising lines, not for falling ones(!) if the background is transparency.
To the right you can see the original PNG (rendered with ristretto) which has white background in the left half and transparent background in ...