Web design software - 242 CHAPTER 6 ERASING AND TOUCHING UP
242 CHAPTER 6 ERASING AND TOUCHING UP Sharpening with the Convolve Tool Dragging the Sharpen tool around the newt s head a little bit produces Figure 6-23. Figure 6-23. The newt is much sharper now. You may notice that the area around the head, and especially the eye, has become a bit grainy. That s what happens when you sharpen something too much (as you may remember from Chapter 2, with Unsharp Mask). If necessary, you can zoom way in and clean up some of that with the Smudge or Clone tools and a very fine brush. By the way, why Convolve ? Why not just call it Blur or Sharpen ? The name comes from convolution, the mathematical operation used to blur or sharpen an image. Blurring with the Convolve Tool The flip side of the Convolve tool is Blur. Why would you ever want to make something more blurry? One good reason to blur is to de-emphasize a distracting background, like the second meerkat in Figure 6-24. A little judicious use of the Blur tool on the rear meerkat s face, and suddenly the front one stands out much more (Figure 6-25). As with Sharpen, you can drag back and forth over the area you want to blur until it s as blurry as you like. (This technique also works well for hiding license plates or other incriminating details.)
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