User Guide

Canvas 12 User Guide
To create a channel mask:
Do one of the following:
Ctrl+double-click the object to be masked.
Select the object to be masked and choose Object | Transparency | New Channel Mask.
Click on the object with the Sprite tool.
Select the object to be masked. In the Transparency palette, choose Channel in the Mask
menu.
Canvas creates the channel mask and puts the new mask in edit mode.
If the object is a paint object, Canvas creates a channel mask with the same resolution as
the paint object.
If the object is a vector, text, or group object, the New Mask dialog box opens. Type the
resolution you want for the channel mask and click OK. Canvas creates the channel mask
with the specified resolution.
To use the Channels palette:
You can create a channel mask for a paint object from an existing alpha channel or color channel.
With a paint object in edit mode, drag an alpha channel into the channel mask slot in the Channels
palette. If the slot already contains a channel mask, the channel you drag there replaces the
existing channel mask.
Editing channel masks
You can edit an object’s channel mask to change the transparency effects it produces. Generally, you
can do anything that you can when editing a color channel, alpha channel, or grayscale image: use
painting tools, filters, and image-adjustment commands, make selections, and paste selections into a
channel mask.
To edit a channel mask:
Do any of the following to place a channel mask in edit mode:
Ctrl+double-click the masked object.
Select the masked object and choose Object | SpriteLayers | Edit Channel Mask.
Select the masked object and click Edit in the Transparency palette.
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