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Grokking The Gimp
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4.4 Conversions of Selections, Channel Masks,
Layer Masks, and Alpha Channels

As has been discussed many times already, selections, channel masks, layer masks, and alpha channels are all different implementations of the same thing. They partition a layer into selected pixels, partially selected pixels, and unselected pixels. Although they all do the same thing, they do it in slightly different ways...ways that are remarkably complementary.

Being able to convert a selection to a layer mask or an alpha channel to a channel mask is often useful, however, it may not always be obvious how to go about it. As an aid to the reader, the table shown in Figure  4.35

  
Figure 4.35: Selections, Channel Masks, Alpha Channels, and Layer Masks: Table of Conversions
Figure 4.35

describes the steps required to convert from any one of the four types to any other. You may want to bookmark this page.




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