Questions about making the opaque backgrond of an image transparent.

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gimp: Background removal gives gray fringe, when exported as pdf

I cut a region out of this wikimedia commons picture: I simply used the free select tool to cut out the part (ctrl+x) and inserted it into another image without background. However, when I export ...
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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 ...