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Hi Rich

If you need any help loading and using the Action, just ask.

Also, many techniques are born of accident, and I bet zig-zag was one of them.  I probably had some interesting images with the wild swings of the Curves Adjustment Layer and then noticed some uses along the way.  

Not too different from the Hue Map.  I was investigating the details behind all the blending modes, including those of Hue, Color, Saturation, and Luminosity, for my learning and possible uses.  When I ran the Hue map and another Action to pull out just the saturation component, the JPEG artifacts stood out. 

It helps identify images that have been compressed, even after compressing somewhere, and then saved as PNGs or TIFFs, etc.   Many types of post processing (especially shifting of Hue, Color, and Saturation) will make the artifacts pop out—a good heads up to ask for a better original if available.

John Wheeler