Web host forum - CHAPTER 2 IMPROVING DIGITAL PHOTOS So input
CHAPTER 2 IMPROVING DIGITAL PHOTOS So input expands tonal range; then output restricts it. The leftmost input slider, which represents the blackest pixels in the image, gets mapped to wherever the black output slider is positioned; and likewise the right input slider gets mapped to the right output slider (Figure 2-18). Figure 2-18. The input sliders, after the image s tonal range has been expanded, map to the output sliders to compress the final tonal range. In most cases, full tonal range is a good thing; once you ve adjusted the input sliders to expand your image s tonal range, you wouldn t want to restrict it again. Most of the time, you may not need the output sliders at all. They re there for the rare cases when an image really needs to have a restricted range, or for images that are legitimately lacking some part of their tonal range (no highlights, or no shadows).
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