Would you believe that I *just* wrote such a macro, in POV-ray itself?!
(Photoshop isn't required.) I made it for my 'city building' generator-- and had
planned to post it, but got side-tracked. It does exactly what you need: finding
the overall average color from the many colors in an image_map.

Give me a day to double-check the code, and I'll post it ASAP. Can't do it
today; I'm temporarily too busy with 'real life'...  :-/

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