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Grokking The Gimp
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4.3.2 Selection Tools

Selection tools can also be used to modify masks. Cutting a selection while a mask is active fills the selected region of the mask with the current Active Background Color. Like the painting tools, selections can be used to add or subtract parts of the mask.

Figure  4.18

  
Figure 4.18: Using Selection Tools on a Channel Mask: Addition
Figure 4.18

shows how a selection in the image window can be used to add white pixels to the mask and, consequently, add to the set of selected pixels represented by the mask. Figure  4.18(a) shows that a selection has been made in the image window, and Figure  4.18(b) indicates that it was made using the Bezier Path tool. Figure  4.18(b) also shows that the Active Background Color is white. Cutting the selection while the channel mask is active produces the result shown in Figure  4.18(c). The selected part of the mask has been removed from the image window. Furthermore, the corresponding part of the mask has been changed to white, as can be seen from the mask thumbnail shown in Figure  4.18(d).

Alternatively, Figure  4.19

  
Figure 4.19: Using Selection Tools on a Channel Mask: Subtraction
Figure 4.19

shows how a selection can be used to add black pixels to the mask, thus subtracting from the set of selected pixels represented by the mask. Figure  4.19(a) shows the selection in the image window and, as indicated by Figure  4.19(b), the selection was made using the Rectangle Select tool. Figure  4.19(b) also shows that the Active Background Color is set to black. The result of cutting the selection using C-x is shown in Figure  4.19(c). All the pixels in the interior of the rectangle selection have been filled with black, which results in the removal of these pixels from the set of selected pixels represented by the mask.

Grokking The Gimp
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