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convert tool, you can resize an image but Imagemagick
does interpolation so the resulting image can look pretty bad.
For example, using the input (animated) gif:
And issuing the command to resize it by a factor of 4:
$ convert tree_anim_inp.gif -resize 400% tree_anim_ugly.gif
produces the interpolated (and ugly) picture:
Instead, use the
$ convert tree_anim_inp.gif -scale 400% tree_anim_out.gif
Save as a
.gif file extension. When exporting, there will be an option to save as an animation:
Check it and you should have an animated GIF.