You can tell by observing the thumbnails in the Layers palette: The active thumbnail always has a border around it. NOTE Sometimes, knowing whether you are working on a mask or the layer content can be difficult. "When painting on masks, it helps to turn off the brush dynamics by choosing Clear Brush Controls from the Brushes palette menu, or by checking them off one by one. Next, select the Brush tool and an appropriate brush tip and then paint on the mask to hide the layer content paint with white to reveal again (press X to switch colors). Before you can paint on the mask, you need to switch the colors around by pressing X (white on white doesn't show too well!). When you create a mask, the foreground and background colors change to white and black, respectively. NOTE You cannot create a mask for a Background layer you must convert it to a normal layer first by double-clicking it. To add a mask to the active layer that does not hide the layer content, choose Layer ^ Layer Mask ^ Reveal All, or click the Add layer mask icon, located at the bottom of the Layers palette (Figure 8-2).įigure 8-2: Detail from the Layers palette. Put another way: black conceals content, as the night does white reveals content, as the daylight does gray partially conceals content, as does a foggy day. Masks work on the principle that where the mask is black, it hides content directly underneath where the mask is white, it reveals content directly underneath where the mask is a shade of black and white, it partially hides the content directly underneath. Both have their uses in the scheme of things. When you create a grayscale mask, you have two options at your disposal: You can either create a mask that hides the layer content (ready for you to reveal underlying content) or one that reveals all (ready for you to hide underlying content).
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