CHAPTER 3 INTRODUCTION TO LAYERS What Is (Fedora web server)
CHAPTER 3 INTRODUCTION TO LAYERS What Is a Layer? Every image the GIMP works with is made by combining one or more separate images, called layers, laid on top of each other. As you ll recall from the discussion of file types in Chapter 2, images can include full or partial transparency. So can layers. In the simplest way of combining layers, normal mode, anything completely opaque (not transparent at all) in the top layer is all you see in the final image. If the top layer is a photograph, like the ones you worked with in Chapter 2, then that s all you ll see in the final image, even if there are other layers underneath. Layers get much more interesting when they include transparency. A transparent layer lets you put part of one image on top of another. Everywhere that the top layer is opaque is what you see in the final image; but where the top layer is transparent, you can see through to the next layer down. If that layer, in turn, has transparency, then you can see through to the next layer down, and so forth. Figure 3-1 illustrates how a layer stack works in an image with several components. The top layer contains text; everything else is transparent. Next down is part of a flower photograph. The edges fade away just outside the flower so anything outside of that is transparent. Under the flower are layers for a picture frame, a shadow cast by the frame, and the background color. When these layers are combined, the image looks like Figure 3-2. Figure 3-1. How multiple layers combine to form an image
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