>>137042 well, gif is a pixel perfect format so there are no compression artefacts like in jpg. the easiest way is probably to do a very narrow colour select (ideally just a single hue) wile adding to the selection (probably: hold shift) and clicking on the individual background colours. since there is green on the medal itself, you might have to manually deselect a pixel or two, then delete the selection and move to the next frame. i can see it being not more than a ~10s workflow per frame, especially on the back side. maybe there's even a way to do a macro select of the 8-12 relevant background hues? probably depends on the tool you're using.
the thing is - the creator of the animation probably has a transparent version...
the square cutting is easy. GIMP puts the frames in as layers, so you just need to crop the image and it applies to all layers; you'll be done in 5s.
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