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This chapter is about a group of tools that aren't really selection or masking tools at all, even though they produce mask like effects. These are the Eraser tools and the Extract command. Permit me to demonstrate using this photorealistic graphic right here. When you select you're masking image, you mark the boundaries along witch you intend to cut the image or lift it away from its background, but you don't actually perform the cut, the image is not harmed in the process and you can add edit the selection or mask as much as you want.
When you erase or extract an image, you not only define the boundery between the foreground and the background, you also erase the background pixels. If you know what the result, you can't edit it, you have to undo and try again. I can't undo this white board pretty get the idea. So why in the world you erase or extract an image when it produces permanent changes, because you can eliminate fringing by leeching the color away from the edge pixels. The process is by no means perfect, but no occasion erase and extract come through with flying colors or more accurately, without them.
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