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Grokking The Gimp
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4.1.3 Making Channel Masks Visible

A channel mask's visibility can be toggled on or off by clicking on its Eye icon. Looking again at Figure  4.2(b), the Eye icon is not visible. Toggling it on, as shown in Figure  4.3(b), and toggling off the image layer's visibility produces the result shown in Figure  4.3(a).

  
Figure 4.3: Viewing a Raw Channel Mask in the Image Window
Figure 4.3

This figure shows that the channel mask is now visible in the image window.

If the Eye icon of the image layer is toggled back on, as shown in Figure  4.4(b), the resulting view in the image window is Figure  4.4(a).

  
Figure 4.4: Viewing an Image Layer Through the Channel Mask
Figure 4.4

The image layer can now be seen through the channel mask. The parts of the image corresponding to the white region of the mask appear clearly, but the parts in the black region appear covered by a dark, semi-transparent film. This demonstrates why these channels are called masks; they allow the selected parts of the image to be clearly seen while ``masking out'' the unselected parts.

Being able to see the image through the filmy parts of the channel mask, as illustrated in Figure  4.4(a), makes it possible to edit the mask according to the features of the image behind it. In this way, the channel mask is like a piece of digital tracing paper placed over the image.

Grokking The Gimp
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