CHAPTER 2 IMPROVING DIGITAL (Mac os x web server) PHOTOS Here s what
CHAPTER 2 IMPROVING DIGITAL PHOTOS Here s what the kestrel looks like when sharpened (Figure 2-31). Figure 2-31. The kestrel after sharpening. The effects of Sharpen are usually fairly subtle. For more extreme sharpening, use Unsharp Mask (Figure 2-32). Don t be misled by the name, which comes from the details of how it works. Unsharp Mask makes an image much sharper not less sharp but it does that by making a blurry copy of the image, and then using that as a mask for the sharpening operation. Like Sharpen, it brings up a window with sliders and a preview area, but it has three parameters you can control, and it s capable of sharpening an image much more than the standard Sharpen. Fiddle with the three parameters of Unsharp Mask and see what they do. Generally speaking, Radius affects the distance over which the sharpening works; make this bigger for large images, or very fuzzy ones. Amount controls how strong the effect will be; make this as small as you can so as not to over-sharpen and end up with a grainy image, or with halos around the object you re hoping to sharpen. Threshold controls the smoothness of the image; if you end up with grainy areas that should look smooth, such as the sky, an adjustment here may help.
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