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Grokking The Gimp
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3.1.2.3 Sample Merged

Normally the Magic Wand selection tool only operates on the pixel values in the active layer. However, if this layer is not fully opaque, or if this layer is using a blending mode (see Chapter  5), some of the pixel values from lower layers affect the color in the active layer. The Sample Merged option in the Tool Options dialog for the Magic Wand takes this into account. When this option is on, it is the merged color values of pixels that are used in the comparison algorithm for the Magic Wand. Figure  3.14

  
Figure 3.14: The Sample Merged Option
Figure 3.14

shows the Sample Merged option toggled on in the Magic Wand's Tool Options dialog.

Grokking The Gimp
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