Adjustment layers are a great tool, and layer masks make them even more powerful. Masks make it possible to selectively adjust the image areas an effect is applied to and the intensity with which it is applied. Without a mask, the entire image will be affected.
Figure 7-16. Our initial image
We will use the rock formation in Figure 7-16 as an example. In order to increase contrast on the rocks, we first select the sky using the Color Range tool and then invert our selection (Figure 7-17 and Figure 7-18).
Figure 7-17. Selecting the sky and then inverting the selection selects the rocks in this image.
Figure 7-18. The ...