I have a problem with resizing images containing a transparency (alpha chanel).
What I am using in my conversion script is
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-autocrop 5 255 255 255
and then resizing the image.
If the image has a transparent background, the autocrop will not crop anything (because the transparent color doesn't match the white color). Therefore I need to remove the transparency with
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-merge_alpha
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-merge_alpha
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-autocrop