[magick-users] invert colors of animated gif?

[Fred Weinhaus]

I am not an expert on animations, but ...

You will likely have to separate the frames (using coalesce), negate 
them (using -negate) or change the color of only the white ones 
(using -fuzz xx% -fill somecolor -opaque white), etc and then 
recombine. But should not be too bad.

See
http://www.imagemagick.org/Usage/anim_basics/
http://www.imagemagick.org/Usage/anim_mods/
http://www.imagemagick.org/Usage/color/
http://www.imagemagick.org/Usage/
http://www.imagemagick.org/Usage/reference.html


if this does not work

convert animation.gif -negate animation_negate.gif

then something like this should work

convert animation.gif -coalesce -negate \
           -quiet -layers OptimizePlus  -loop 0 animation_negate.gif



>I have an animated gif image of a progress spinner which I am trying to use on
>a black background, however the spinner has some white pixels around it which
>makes it look pretty bad.
>
>I am curious if imagemagick has a way to invert the colors on all frames of
>a gif image?  And if so, how to do it.
>
>Thank you.
>
>Patrick J. Collins
>http://collinatorstudios.com