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Grokking The Gimp
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4.1.7 Partially Selected Pixels

Partially selected pixels are especially important at selection edges because they allow the selection to blend more smoothly with other image layers. The subject of partially selected pixels has already been discussed to some extent in Section  3.1.2, which presented the concepts antialiasing and feathering.

A powerful feature of masks is that they provide an easy way to create and to work with partially selected pixels. As has already been discussed, a white pixel in a channel mask represents a fully selected pixel in the image window, a black pixel fully unselected, and a gray pixel partially selected. Thus, channel masks allow for partially selected pixels, and, moreover, provide a framework on which any of the GIMP's filters and functions can be applied. This makes channel masks a particularly flexible and versatile medium for working with partial selections. Some examples of using GIMP filters on masks are illustrated in Section  4.3.5.

Grokking The Gimp
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