The Footage, Composition, and Layer panels allow you to view the individual red, green, blue, and alpha channels of an image. Color channels appear as grayscale images in which the degree of white corresponds to the color value. You can also view the color channel using its own color. The alpha channel appears as a grayscale image as well, where the degree of white corresponds to opacity. You can even view the unmultiplied color channels—that is, the color channels without the alpha taken into account.
To show individual channels, follow these steps:
- In a Footage, Composition, or Layer panel, click the Show Channel button, and then choose the channel you want to view (see Figure 22):
- RGB shows the normal image with visible channels combined.
- Red, Green, or Blue shows the selected channel as a grayscale.
- Alpha shows the alpha channel (transparency information) as a grayscale. If active, the transparency grid is disabled while Alpha is selected (see Figure 23). See the next section, "Viewing Transparency."
- RGB Straight shows the unmultiplied RGB channels. The transparency grid is disabled while RGB Straight is selected.
- To show the selected channel depicted in color, select Colorize (see Figure 24).
The Channel pop-up menu's icon changes according to the current selection.
Figure 22 Click the Show Channel button and select the channel you want to view.
Figure 23 Choose Alpha to see the alpha channel.
Figure 24 To see the selected channel in color, select Colorize from the pop-up menu.