
538 Corel Painter X3 Getting Started Guide
Editing channels
You can edit a channel by modifying the size, shape, or opacity of its protected area,
which ultimately becomes the protected area of the selection. The changes that you
make to the channel do not directly affect the image until you load it as a selection. For
more information, see “To load a selection from an alpha channel” on page 558.
Because the alpha channel is a grayscale image, you edit the channel by applying only
white (to remove protected areas), black (to add protected areas), and shades of gray (to
create semi-protected areas); no colors are available.
You can apply changes by selecting a brush and painting the changes in the channel.
In this example, the channel has a few stray areas that are unprotected (left).
The stray areas were transformed into protected areas by applying black
brushstroke (right).
In addition, you can apply effects, such as feathering to soften the transitions between
light and dark areas. This introduces a bit of opacity to the channel.
A channel — before and after feathering.
You can also invert a channel to convert a protected area into an unprotected area.
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