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Grokking The Gimp
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4.5.2 The Quick Mask

The previous section showed you how a channel mask could be used to refine a selection. This is so useful that the GIMP has a special pair of function buttons on the image window allowing a selection to be quickly converted to a channel mask and vice versa. These are called the Quick Mask buttons.

Figure  4.41(a)

  
Figure 4.41: Using the Quick Mask
Figure 4.41

illustrates an image with a selection. It also shows a button circled at the lower-left side of the image window containing a red square icon. This is the Quick Mask button. Clicking on it converts the selection to a mask, as shown in Figure  4.41(b). The button shown circled in Figure  4.41(b) contains an icon showing a square drawn in a dashed line and resembling the Marching Ants. Clicking on this button reverts the quick mask to a selection. Thus, the Quick Mask buttons can be used to quickly convert a selection to a mask that can then be edited, as described in Section  4.5.1, before being converted back to a selection.

Figure  4.42

  
Figure 4.42: Quick Mask Options
Figure 4.42

shows two features of the Quick Mask buttons. Double-clicking either of the buttons brings up the Edit Qmask Attributes  dialog. This dialog, shown in Figure  4.42(a), permits the default opacity and color of the mask to be modified. The second feature of the quick mask is shown in Figure  4.42(b). When the quick mask is created, it also appears in the Channels dialog with the label Qmask in the Channel Title area. This channel exists only as long as the quick mask and disappears as soon as the mask is reverted to a selection.

Grokking The Gimp
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