Applying Adjustment Layers
Using adjustment layers is quite easy. Here’s how:Select the layer you want the adjustment layer to appear above.You can also use the selection tools to select a specific area that you want to correct.For this example, I’m using an underexposed photograph of bottles (see Figure 22-1), and I use the Levels command to correct it.

Figure 22-1: This photograph is way underexposed.
Click the New Fill or Adjustment Layer button at the bottom of the Layers palette, and choose an adjustment command from the menu (see Figure 22-2).

Figure 22-2: Choose an adjustment command from the New Fill or Adjustment Layer menu.
Tip | The top three commands on the menu are for creating a fill layer. If you need to recolor an image, turn to Technique 21 to find out how to apply a fill layer. |
Depending on the adjustment command you select, the dialog box for that command appears, as shown in Figure 22-3.

Figure 22-3: For this example, I used the Levels command.
Use the dialog box to make the adjustments, and then click OK.The adjustment layer appears in the Layers palette and the image is corrected (see Figure 22-4).

Figure 22-4: The Levels adjustment layer corrects the photograph’s underexposure.