Clipping Groups and Knockouts

Clipping groups and knockouts are advanced masking techniques involving multiple layers. Clipping groups allow you to use one layer as a mask for a group of layers. Knockouts allow you to use the content of one layer to "tunnel through" a stack of layers, knocking out pixels on each layer along the way. Let's take a look at how they work with a couple of example files.

1. Open the file ClippingGroup.psd from the CD. It has three layers: Sky, Get Away (rasterized text), and Lagoon (off).

2. Turn on the Lagoon layer. It obscures the layers below it in the Layers palette, so now you see only the Lagoon image. You will first create a clipping group so the Lagoon image shows through the Get Away text.

3. Hold down the Alt key and hover your mouse in between the Get Away and Lagoon layers. Your cursor changes into the Clipping Group icon.

is 0

4. While you see the Clipping Groups cursor between the layers, click the mouse. The bottom layer in the new clipping group acts as a mask which the other layer(s) in the clipping group show through.

The Get Away layer is underlined, indicating that it is acting as the base (which functions as a mask) of the clipping group. The Lagoon layer is indented and has a downward facing arrow to indicate its new status as member of the new clipping group. The Lagoon image now shows through the text, as shown in Figure 1.27.

TIP On your own, try to rearrange the clipping group so that the Sky layer shows through the text on a Lagoon background.

5. Close the file without saving.

6. Open the file Knockout.psd from the CD (see Figure 1.28). There are three layers: Background (Lagoon image), Brush Strokes, and Get Away (rasterized text). We will use the Get Away layer to knock out the Brush Strokes layer and show through to the Background layer underneath.

Figure 1.27

Creating a clipping group

0 0

Post a comment