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We did a rethink on channels, selections and masks last summer.
Traditionally, a mask is seen as an extra channel for an image, analogous
to the alpha channel. We want to do away with that idea.
A layer can have a number of permanent selections associated with it.
Such a selection can handle a composite method (determining the composition method
for the selected pixels) or a filter (making it an adjustment layer).
Of course, a selection is just an 8-bit per pixel single channel layer that
belongs to a layer, so all filters can work automatically on a selection,
except that we don't have the ui for that yet.
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