CHAPTER 2 IMPROVING (Unlimited web hosting) DIGITAL PHOTOS Figure 2-15.
CHAPTER 2 IMPROVING DIGITAL PHOTOS Figure 2-15. Both brightness and contrast have been increased. Levels The Brightness-Contrast tool is straightforward and useful. But the GIMP has two other brightness tools that are much more powerful: Levels and Curves. As with Brightness-Contrast, make sure that Preview is checked so that you can see the effects as you play with settings. Levels (Figure 2-16) has two sets of controls: Input Levels and Output Levels. Input Levels shows a histogram representing the current brightness, or tonal range of the image: this is a graph where the horizontal axis represents brightness, and the vertical axis represents the number of pixels that have that brightness. If the image is fairly well balanced, then the histogram should be spread fairly evenly across the image. Such an image is said to have full tonal range. If an image is way under- or over-exposed, the histogram is probably bunched up at one end or in the middle, or shows a spike over to the left or the right. Such an image has a reduced tonal range it is not using all the possible pixel values that can be displayed.
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