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John,

Thanks for the reply. I saw your action file for creating a Hue map. In my 17 years of Photoshop use, I have actually never used or investigated actions, so I'll first need to brush up on them to make full use of your attachment.

Regarding the zig-zag curves adjustment, I'm attaching a tutorial showing where I first came across it. This is a fairly straightforward tutorial for eliminating dust and scratches. The zig-zag curves technique is mentioned at 4:30 in the video. It is simply a temporary measure to create extreme color separation as a visual aid for identifying imperfections that might otherwise be missed at normal viewing. I tried it for fun on several images and I always seem to like the result. It's like a child's coloring book... if that child were taking LSD.

There's a lot going on in your detailed explanation of the curves adjustment, so I'll have to read it carefully a few more times to fully absorb it. Thanks again for the reply.

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