I didn't know crop marks could be removed, until a forum member told me about it. Now I find that some of the white or grey marks can be removed, some can't. Same for thin black ink lines that you would think could not be removed. The few times I tried it, results were mixed, so in general I don't attempt it, but I've seen beautiful photos where the entire 'painted out' gray background had been wiped off.
I think the original example I posted had thin black lines that could not be removed completely.
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