Replacing colors in an image with ColdFusion - Anyone know how?

A reader sent in this request today:

I'm trying to find a way to leverage open source/built-in image manipulation to allow me to replace one color in an image with another determined by a user. Have you run into this before or do you have any suggestions?

So I was sure Alagad's Image Component would have this as it has a large number of methods, but it did not. (Alagad isn't open source or free but at 70 bucks it is a dang solution.) Rick Root's Image.cfc doesn't seem to have this either.

So does anyone else know of a solution that will do this?

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