If you want white pixels in the channel to indicate selected
pixels, choose Masked Area.
If you choose Selected Area, the normal operation of the
channel will be inverted, so that black pixels in the channel
will select pixels when the channel is loaded. If you use this
option, keep in mind that the channel will make selections
that are the inverse of normal channel selections.
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To change the mask tint color for the channel, select a color
from the Color pop-up menu. Canvas displays the tint when an
alpha channel and at least one other channel are visible. To change
the opacity of the tint color, enter a value from 1 to 100% in the
Opacity text box.
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After entering the settings you want, click OK.
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. Painting tools and filters affect active channels only.
You can make more than one channel active by Shift-click-
ing the names of the channels in the palette.
To make a channel visible but not active, click the left col-
umn to make an eye icon appear.
You can make more than one channel visible by dragging in
the left column in the Channels palette.
To make all color channels in an image both visible and active, click
the composite channel in the Channels palette. The composite chan-
nel 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.