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Grokking The Gimp
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4.5.3 Finding the Natural Mask

Performing a selection requires separating the subject, the part of the image that interests us, from the background. Often the subject has colorspace features that differentiate it from the background, and the goal of this section is to explain how to exploit this fact. Since the techniques described in this section depend on using an image's natural color features to make the selection, I call this finding the natural mask. The methods are based on using two primary tools: Threshold, found in the Image:Image/Colors menu, and Decompose, found in Image:Image/Mode. The natural mask approach often allows the subject to be extracted in a single, bold operation.

Grokking The Gimp
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