Using channel masks This next example shows you how to create another transparent effect in an image. You can do this by painting in a channel mask. To create transparent edges with a channel mask Let’s start off with a different image. This time we’ll load a file by using the Acquire command. 1 Choose Image > Acquire > TIFF. 2 In the directory dialog box, select the file named “Image2.tif” in the Tutorial folder. Click Add. 3 Click Done. Note: The Acquire command lets you perform batch importing of image files. You can select multiple files and use “Add” or “Add All” to move the files to the lower window. Then click Done. Canvas places the image in the center of your screen. To help illus- trate some of the channel operations, open the Channels palette. 4 Choose Image > Show Channels. 5 To create a channel mask, press Option (Mac) or Ctrl (Win- dows) and double-click the new paint object. By doing this, you cre- ate a channel mask and select it for editing. In the Channels palette, you’ll see separate Red, Green, and Blue channels, as well as a channel mask in the lower portion of the Chan- nels palette. 6 Select the Airbrush tool from the Painting tools palette. When you work with image-editing functions, it is helpful to tear off this tool palette from the Toolbox. To do this, drag the tool palette away from the Toolbox. You can reposition or shape the tool palette so it doesn’t obstruct your work space. 7 Select black as the Foreground color from the Toolbox. Channels palette
Canvas 8 Help: Introduction to image editing (7 of 12)                                              Page #41