[magick-users] invert colors of animated gif?

[Patrick J. Collins]

Thank you so much..  your 2nd suggestion worked perfectly!  ImageMagick is
really amazing!!

Patrick J. Collins
http://collinatorstudios.com


On Sat, 21 Jun 2008, Fred Weinhaus wrote:

> 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
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