Questions about making the opaque backgrond of an image transparent.

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Using GIMP to extract a background from a set of pictures

I've got a set of pictures of a group of people that were taken on a tripod. Some of the people moved between pictures, and I want to extract a common background so I can combine the backgrounds to ...
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Making background transparent using gifsicle

I was recently turned onto gifsicle by another question, for making backgrounds transparent. Currently I am working on this gif file: . This purple background I'd like to make transparent. Currently ...