PDF (adobe.com)

Select and display the layer mask channel

For easier editing of a layer mask, you can display the grayscale mask by itself or as a rubylith overlay on the layer.

 Do one of the following:

  • Alt-click (Windows) or Option-click (Mac OS) the layer mask thumbnail to view only the grayscale mask. To redisplay the layers, Alt-click or Option-click the layer mask thumbnail, or click an eye icon .

  • Hold down Alt+Shift (Windows) or Option+Shift (Mac OS), and click the layer mask thumbnail to view the mask on top of the layer in a rubylith masking color. Hold down Alt+Shift or Option+Shift, and click the thumbnail again to turn off the color display.