User Guide

Canvas 12 User Guide
Activating channels
To edit a channel:
Click the channel name in the Channels palette to make it active. Canvas uses shading to indicate
that a channel is active.
You can make more than one channel active by Shift-clicking the names of the channels
in the palette.
To make a channel visible but not active, click the left column to make an eye icon
appear.
You can make more than one channel visible by dragging in the left column in the
Channels palette.
Painting tools and filters affect active channels only.
To make all color channels in an image both visible and active:
Click the composite channel in the Channels palette. The composite channel always appears first
at the top of the Channels palette.
Editing an alpha channel
You can apply painting tools, filters, and effects to the image in an alpha channel. By editing the
image, you can adjust what the channel will select when you load it as a selection.
Canvas displays a shaded mask representing an alpha
channel when the alpha channel and the composite
channel are visible
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