Adobe PHOTOSHOP 5.0 User Manual page 261

To edit an alpha channel:
Use a painting or editing tool to paint in the image.
Paint with black to add to the channel; paint with
white to remove from the channel; paint with a
lower opacity or a color to add to the channel with
lower opacities.
To save a selection to a new channel with default
options:
Select the area or areas of the image that you
1
want to isolate.
Click the Save Selection button (
2
bottom of the Channels palette. A new channel
appears, named according to the sequence in
which it was created.
To save a selection to a new or existing channel:
Select the area or areas of the image that you
1
want to isolate.
Choose Select > Save Selection.
2
For Document, choose a destination image for
3
the selection.
By default, the selection is placed in a channel in
your active image. You can choose to save the
selection to a channel in another open image with
the same pixel dimensions or to a new image.
4 Choose a destination channel for the selection.
By default, the selection is saved in a new channel.
You can choose to save the selection to any existing
channel in the selected image or to a layer mask if
the image contains layers.
5 If you're saving the selection to an existing
channel, select how to combine the selections:
Replace Channel to replace the current selection
•
in the channel.
Add to Channel to add the selection to the
•
current channel contents.
Subtract from Channel to delete the selection
•
from the channel contents.
Intersect with Channel to keep the areas of the
•
new selection that intersect with the channel
contents.
) at the
Click OK.
6
Select the channel in the Channels palette to see
7
the saved selection displayed in grayscale.
To change options for a channel:
Do one of the following:
1
Select the channel in the Channels palette, and
•
choose Channel Options from the palette menu.
Double-click the channel name in the Channels
•
palette.
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