Figure 4.11

Use the Calculations dialog to make an alpha channel.

2. Click the Channels palette, and notice that the result from the previous step became a new channel called Alpha 1 and is selected. Figure 4.12 shows the result.

3. Click the RGB channel to return the normal color image to the document window.

4. Flatten the image. You can do so from the main menu (choose Layer > Flatten Image) or by clicking the arrow at the top right of the Layers palette to display the palette menu (see Figure 4.13).

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