Changing the Opacity

When you paint on a mask, you can alter the opacity of the strokes by using pen pressure or by specifying the opacity level for the Brush tool in the options bar. However, after a mask has been created, you have no obvious way to lower its opacity or, rather, it becomes obvious only after you remember that a grayscale mask is composed of a grayscale image. After you remember that little fact, it requires only a small leap to link a change in opacity with the Levels command: more precisely, the use of the bottom two Output Levels sliders (Figure 8-8). To make the mask more opaque (black), move the white slider to the left. To make the mask more transparent (white), move the black slider to the right.

Figure 8-8: You can use the Output sliders in the Levels dialog box to alter the opacity of a grayscale layer mask.
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