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Hour 20. Making Composite Images > Using Adjustment Layers to Fix Image Problem...

Using Adjustment Layers to Fix Image Problems

Adjustment layers are used to make particular types of adjustments to the layers below the adjustment layer, or to the layers grouped with it. After I list the types of adjustments you can make, we’ll talk about controlling which layers are affected.

With an adjustment layer, you can adjust the levels, brightness/contrast, and hue/ saturation. These adjustments correspond to the commands you learned how to use on an entire image in Hour 12, “Too Light/Too Dark: Adjusting Brightness, Contrast, and Color.” You can also add a gradient map (a layer that blends one color into another), invert colors (by switching them for their opposites on the color wheel), adjust the threshold (convert the affected layers to high-contrast black and white), or add a posterize effect (which lets you limit the number of tones or shades used in all three color channels, creating a flatter look with less subtlety). You’ll learn about the Posterize and Threshold adjustments in Hour 21, “Going Wild with Your Images,” and gradients in Hour 22, “Creating Backgrounds and Textures from Scratch.”


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