How can I open a gif with GIMP and adjust the framerate?
When I try to reexport it, the option for this is whited out (see screenshot below):
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Just click on the
As Animation checkbox - it will enable the animation options (and actually save an animation, instead of a flatenned GIF image)
That is your answer - but taking the opportunity to get repeat an information that is somewhat hard to find or understand: if you want to customize the frame duration of any specific layer, it is possible to do that by putting a special sequence in the given layer's name within GIMP: on it's name include the frame duration in milliseconds, post fixed by "ms". That is, if you want the last (topmost in GIMP) frame to stay on the screen for 3 seconds, just add
(3000ms) as part of its name.