Is there an easy way to create a "saturation-map" in Photoshop/Gimp? I need a grey-scale version of an image showing where the colors have less saturation (black) and where they have more saturation (white).

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You want to convert your image to a HSV/HSB model (Hue, Saturation, Brightness). The saturation is what you're looking for.

Photoshop cannot do this natively, but you might find a plugin that does that for you. The GIMP has this built in, just open the image and select Colors > Components > Decompose from the menu. A dialog will open where you can select the color model to "decompose" to. Convert to HSV and you'll get an image with 3 layers, one of them being labelled "saturation" which is your saturation-map (bright pixels = higher saturation)

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