Teach Yourself Adobe Photoshop CS2.pdf - Online Public Access ...

This document was created by an unregistered ChmMagic, please go to http://www.bisenter.com to register . it. ThanksHealing Brush and Patch ToolsRetouching has always been one of the major reasons why people buy and learn to use Photoshop. Recognizing this, the folks at Adobehave made the job easier with some tools specifically designed to touch up your photos. They are the Healing Brush, Spot HealingBrush, and Patch tools.The Healing Brush, which looks like a Band-Aid, can be applied to any kind of spot that needs removal. Instantly, it's gone, and withoutaffecting anything but the spot. Sort of like digital zit cream. But it works quite differently, by using some fairly complicated math toaverage the texture, lighting, and shading of each group of pixels in order to locate the ones that are out of the normal range. Thosenonconforming pixels represent the spot, and they're simply replaced by pixels that match the average tone that should be there. Youcan actually watch them change. Of course, you can heal any kind of surface, not just skin.When using the Healing Brush, you Option+click (Alt+click) to choose a source from which to copy pixels. The difference between theHealing Brush and the Clone Stamp is that the Clone Stamp works by simply copying and pasting the group of pixels you have selected,whereas the Healing Brush melds the replacement pixels into the original ones. The changes are less obvious. In Figure 21.11, I've triedto clean up the stray hair and sweat on the man's forehead with both the Clone Stamp, on the left, and the Healing Brush on the right.Judge for yourself which one looks better. (You really have to see this in color. Flip to the color plate section.) The main thing you needto be careful about is that if you apply the Healing Brush very close to dark hair, it will pick up extra dark pixels and average them into thecorrection as well, making a darker spot on the face. You can mask the hair before you start, or just use the Clone Stamp on thoseplaces.Figure 21.11. On the left, cleaned up with the Clone Stamp. On the right, same skin, cleanedwith the Healing Brush and Spot Healing Brush.The Spot Healing Brush is like a quick-and-dirty version of the Healing Brushor maybe that should be quick-and-clean. Instead ofdefining a point from which to copy new pixels, then painting, all you do with the Spot Healing Brush is click on the spot you want toeliminate. Photoshop looks at the area around the spot, averages the colors it finds, covers the spot with the average color, and blendsthe repair in with its surroundingsall in about half a second. For slightly larger spots, you can click and drag, but make sure that the spotyou're trying to eliminate is located in the middle of a relatively uniform area so that the tool doesn't pull in different-colored pixels from anadjacent area.For larger areas, there's the Patch tool. Like the Healing Brush tool, it matches the texture, lighting, and shading of the sampled pixels to