Virtual web hosting - CHAPTER 2 IMPROVING DIGITAL PHOTOS Options in
CHAPTER 2 IMPROVING DIGITAL PHOTOS Options in the Curves Dialog The Linear versus Logarithmic buttons at the upper-right of the dialog control the way the histogram is presented, just as in Levels; they have no effect on the operation of Curves. At the lower-right are two buttons for Curve Type. By default, the Curves dialog will make a smooth curve connecting your control points; but if you want finer control than that, click on the Freehand button and draw your desired curve directly. At the lower-left are buttons enabling you to Save a curve, or Open one you ve previously saved. This may be helpful if you have a large number of images that all have basically the same exposure problems. Other Exposure Adjustments In addition to the three general tools for adjusting exposure, the GIMP s Colors menu has several other useful tools. Threshold (Figure 2-21) lets you map an image to black and white, adjusting the threshold point between the two. Like Levels and Curves, Threshold shows a histogram of the image s brightness. The area between the black-and-white sliders, colored blue, represents the range that will be white in the final image. You can drag the sliders directly, or mouse down in the histogram area and drag out the area that should be white. Figure 2-21. The Threshold dialog
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