Christian web host - CHAPTER 5 SELECTION 203 Layer Masks A
CHAPTER 5 SELECTION 203 Layer Masks A layer mask defines how much, and which parts, of a layer will be visible. Layer masks are not actually a selection tool. But you can use them in many of the same ways you d use a selection. For some jobs, a layer mask may be easier and more intuitive than using a selection. A layer mask is actually a black-and-white image, like a channel or the QuickMask. It represents the alpha channel of the layer. The whiter the mask is, the more the affected layer shows through the less transparent it is. Wherever the channel mask is dark, the image will appear transparent. It may help to think of the mask as a film negative placed on top of your image. Anywhere the film is black, you can t see your image; anywhere the film is clear (or in this case, white), the layer can be seen. Layer masks are particularly useful when combining images. For instance, I have an ostrich (Figure 5-37) and a giraffe (Figure 5-38). What if I want to make an ostraffe? Figure 5-37. An ostrich
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