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I am trying to stitch together a bunch of .png's which contain some alpha (transparency) but which have a uniformly white background. The png's look fine individually, but in the resulting .gif some frames acquire a patchy background that appears to have the same RGBA color as some of the points being animated.

example of glitchy behavior

I have tried the following commands

convert -delay 1 im*.png anim.gif
convert -delay 1 -alpha set im*.png anim.gif
convert -delay 1 -alpha set -dispose background im*.png anim.gif
convert -delay 1 -alpha set -dispose previous im*.png anim.gif
convert -delay 1 -alpha set -dispose previous -background white im*.png anim.gif

pretty much just trying additional flags to see if anything happens to fix the glitch, but I get the same behavior in every case. Anyone have a fix?

S E Clark
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1 Answers1

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Ah, this question led me to the right answer -- 

convert -delay 1 -layers Optimize im*.png anim.gif

works!

Community
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S E Clark
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