CHAPTER 2 IMPROVING DIGITAL PHOTOS As soon
CHAPTER 2 IMPROVING DIGITAL PHOTOS As soon as you click on the line, the GIMP creates a control point: a handle you can use to grab the curve and drag it higher (brighter) or lower (darker). You can go back and click again on an existing control point and slide it up or down along the curve, or you can leave existing control points where they are and click somewhere else on the line to create more control points (Figure 2-20). If you need to get rid of a control point you ve made, just slide it all the way left or right to another control point or to one of the endpoints of the curve. Figure 2-20. Control points in the Curves dialog The advantage of the Curves tool (besides being fun to play around with) is that you can easily control which parts of the image are adjusted. The upper-right part of the curve corresponds to parts of the image that are already bright, while the lower-left part corresponds to darker areas. If most of the image is fine, but there are some bright areas that look blown out and you just want to tone those down, you can make a curve that s straight except at the upper-right, where it curves below the original line to make the bright areas darker. Then if the dark parts are too dark, you can grab the lower-left corner and drag it upward to brighten just those parts. You can make as many control points as you wish, and as complicated a curve as you desire, to fine-tune the correction you will make. (The catch is that such complex curves seldom accomplish much more than a single control point moved to the right place on the curve. But try it yourself. Experiment and see what you can do!)
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