Did you look at thumbnail creation for IM examples (see signature)
Also if you are dealing with GIF animations, that is a lot more trickier as it is multiple images (or image parts). See the animation section for the deails of this.
Most thumbnails fro animations are often either scaled versions of the animation (not good) or a extraction of a single coalesced frame.
NOTE: GIF animation is at this very moment being imroved in IM, including things like better frame optimization and disposal determination, and other conversions for animations.. The notes of these comming additions are in the IM example pages on animations. Read them.
Ideas for future additions not yet looked at are very welcome RIGHT NOW!!!
As I am working on this area at this time.
Simple Thumb Creation
- anthony
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Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/