Kovid,
If I've understood things, the first request is legitimate and not exclusively relevant to an image editor. He's asking for a means of handling a potential color-on-color display problem. In his case a grey image on a gray background makes it hard to proof any mark-up used on the image. This is roughly equivalent to correcting a white text on a white background display problem. I think as ebooks evolve into color content we might well be seeing more of this type of problem.
The zooming I've got to admit I don't quite understand. The only real use for zooming would be to facilitate exact placement - which is impossible in a reflowable text document. Unless the result is meant to be published only to a single file format.
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