Adobe 23101335 User Guide - Page 210
Creating alpha channels Photoshop, Saving a mask selection, Choose New Channel from the Channels
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200 CHAPTER 7 Using Channels and Masks Creating alpha channels (Photoshop) You can create a new alpha channel and then use painting or editing tools to add the mask to it. To create an alpha channel using current options: 1 Click the New Channel button ( ) at the bottom of the Channels palette. The new channel is named according to the sequence in which it was created. 2 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 create an alpha channel and specify options: 1 Do one of the following: • Alt-click (Windows) or Option-click (Mac OS) the New Channel button ( ) at the bottom of the palette. • Choose New Channel from the Channels palette menu. 2 Type a name for the channel. 3 Select display options for the channel, as described in steps 2 through 4 of the procedure for changing Quick Mask options in "Creating temporary masks in Quick Mask mode (Photoshop)" on page 197. Alpha channel options are identical to Quick Mask options. 4 Click OK. A new channel appears at the bottom of the Channels palette and is the only channel visible in the image window. 5 Click the eye icon ( ) next to a color channel or the composite color channel to display the image with a color overlay. 6 Use a painting or editing tool to paint in the image. Paint with black to add to the new channel, paint with white to remove from the new channel, or paint with a lower opacity or a color to add to the new channel with lower opacities. Saving a mask selection You can save any selection as a mask in a new or existing alpha channel. To save a selection to a new channel with default options (Photoshop): 1 Select the area or areas of the image that you want to isolate. 2 Click the Save Selection button ( ) at the 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: 1 Select the area or areas of the image that you want to isolate. 2 Choose Select > Save Selection. 3 In the Save Selection dialog box, choose a destination image for the selection in the Document menu. 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.