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.
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