
572 | Corel Painter 2015 User Guide
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.
A channel — before and after inversion.
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