Legacy ImageMagick Discussions Archive

Thanks, I already took a look at the docu.
I think, I'm going to choose a very pragmatic way and use -sample for all gif manipulations having a width < 17 px and leave the other transformations untouched
Maybe I can remove this workaround one day if this behaviour is fixed in newer IM versions.

Thanks for the hint. I have to compare the results of resize and sample first before fixing our application.
Are there any well-known-but-poor-documented pitfalls when switching from resize to sample?

I can confirm this behaviour in Versions 6.7.7-5/6.7.6-4 (gentoo) and 6.6.2-6 (ubuntu). Converting a gif with transparency to a gif with less then 17px width/height results in a black gif. convert 1x1.gif -resize 16x16 converted.gif -> Fails convert 1x1.gif -resize 17x17 converted.gif -> Success