Adobe Photoshop CS2 CLASSROOM IN A BOOK [Electronic resources]

Anita Dennis

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Loading a mask as a selection and applying an adjustment

Next, you'll load the Egret channel mask as a selection. The channel mask remains stored in the Channels palette even after you've loaded it as a selection. This means that you can reuse the mask whenever you want.

In the Channels palette, click the RGB preview channel to display the entire image, and then click the eye icon () for the Egret channel to hide it.

Choose Select > Load Selection. Click OK to accept the default options in the Load Selection dialog box.

The egret selection appears in the image window.

Click the Layers tab to bring it forward again in the palette group, and make sure that the Background layer is selected.

Now that you've corrected any flaws in the selection by painting in the channel, you'll adjust the tonal balance of the egret.

Loading a selection into an image using shortcuts

You can reuse a previously saved selection by loading it into an image. To load a saved selection using shortcuts, do one of the following in the Channels palette:

Select the alpha channel, click the Load Channel as Selection button at the bottom of the palette, and then click the composite color channel near the top of the palette.

Drag the channel that contains the selection you want to load onto the Load Channel as Selection button.

Ctrl-click (Windows) or Command-click (Mac OS) the channel containing the selection you want to load.

To add the mask to an existing selection, press Ctrl-Shift (Windows) or Command-Shift (Mac OS), and click the channel.

To subtract the mask from an existing selection, press Ctrl-Alt (Windows) or Command-Option (Mac OS), and click the channel.

To load the intersection of the saved selection and an existing selection, press Ctrl-Alt-Shift (Windows) or Command-Option-Shift (Mac OS), and select the channel.

Choose Image > Adjustments > Auto Levels. This automatically adjusts the tonal balance of the colors within the selection.

Auto Levels defines the lightest and darkest pixels in each channel as white and black, and then redistributes the intermediate pixel values proportionately.

Choose Edit > Undo to compare the adjustment you just made. Then choose Edit > Redo to reapply the adjustment.

Choose Select > Deselect.

Choose File > Save.