@vanepp: OK, thanks, I'll take a stab at it. I'm somewhat familiar with image processing from a technical-user perspective, although I don't claim to be a graphics programmer. As I mentioned above, I tried Old_Grey's suggestion, and it doesn't quite work; the "edit" part seems to, but then the voltage drop-down options don't actually change, and I can't save the result in any case, because the save-bin window freezes. But it's good to know for the future.
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