Creating channel masks You can use the mouse, the New Channel Mask command, the Transparency palette, or the Channels palette to make channel masks. To create a channel mask Do one of the following: •   Option+double-click (Mac) or Ctrl+double-click (Windows) the object to be masked. (If the object already has a channel mask, Canvas places the channel mask in edit mode.) •   Select the object to be masked and choose Object > Transpar- ency > New Channel Mask. •   Select the object to be masked. In the Transparency palette, choose Channel in the Mask pop-up 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 appears. 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 chan- nel mask slot in the Channels palette. If the slot already contains a channel mask, the channel you drag there replaces the existing chan- nel 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 selec- tions, 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:
Canvas 8 Help: Selections and channels (26 of 32)                                                   Page #676