Resize animated GIF file without destroying animation

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if you have imagemagick access, you can do this:

system("convert big.gif -coalesce coalesce.gif");
system("convert -size 200x100 coalesce.gif -resize 200x10 small.gif");

this is most likely possible with the imagemagick plugin if you don’t have system() access

NOTE: this may create a larger filesize though a smaller dimensions image due to coalescing essentially deoptimizing the image.

UPDATE:
If you don’t have ImageMagick access, you should be able to use a combination of the following steps to resize an animated gif (assuming you have GD access):

  1. Detect if the image is an animated gif: Can I detect animated gifs using php and gd? (top answer)
  2. Split the animated gif into individual frames: http://www.phpclasses.org/package/3234-PHP-Split-GIF-animations-into-multiple-images.html
  3. Resize the individual frames: http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/
  4. Recomposite the frames into an animated gif again: http://www.phpclasses.org/package/3163-PHP-Generate-GIF-animations-from-a-set-of-GIF-images.html

This is definitely much more intensive than the ImageMagick route, but it should be technically possible.

If you get it working, please share with the world!

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