•   Option+double-click (Mac) or Ctrl+double-click (Windows) the masked object. •   Select the masked object and choose Object > Transparency > Edit Channel Mask. •   Select the masked object and click Edit in the Transparency palette. When you finish editing a channel mask, press Esc to leave edit mode. Detaching and deleting channel masks If an object has a channel mask, the channel mask controls the trans- parency of the object. You might want to detach or delete the channel mask to eliminate the transparency effects from the object. When you delete a channel mask, it no longer exists in the document. When you detach a channel mask, it appears in the document as a separate grayscale paint object. To detach a channel mask:  Select the masked object. Choose Object > Transparency > Detach Mask. When you detach a channel mask, Canvas removes the channel mask from the object and places it in the document as a separate grayscale paint object. If the channel mask was detached from a vector object, the resulting paint object will contain any alpha channels that were contained in the vector object. To delete a channel mask 1 Select the masked object. 2 In the Transparency palette, choose None in the Mask pop-up menu. Note: Deleting the channel mask of a vector, text, or group object also deletes any alpha channels that were contained in the object. Also, if you ungroup a group object that has a channel mask, Canvas deletes the channel mask. You can delete a paint object’s channel mask when the paint object is in edit mode by dragging the channel mask to the trash can icon at the bottom of the Channels palette.
Canvas 8 Help: Selections and channels (27 of 32)                                                   Page #677