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I see Gilles created the tag image-manipulation, and it happens to be used exactly once. I'm wondering if that was an oversight, or if it's supposed to be distinct from image-editor tag.
I think the image-manipulation tag could be applied to command line tools such as convert or imagemagick, whereas image-editor would be more relevant to Image Editing GUI applications, such as GIMP.
So for me these two tags are a bit different.