The Contrast control enhances the tonal separation, especially in the midtones. Increasing contrast moves midtones (gray) toward black or white. Decreasing contrast makes blacks and whites appear gray.
The Contrast control on the Xerox Nuvera applies to all of the pixels in an image at once. In other words, changing the contrast in the midtones of your image will also affect highlights and shadows.
If contrast is increased too much, midtone detail may be enhanced, but at the expense of highlight and shadow content. Differences between adjacent pixels become greater, causing shadow areas to turn completely black, while highlight areas turn completely white (see Figure 1).
On the other hand, decreasing contrast too much causes a loss of highlights and shadows. Instead of highlight content turning completely white and shadow content turning completely black, highlights and shadows get "compressed" into the midtone region of the histogram (see Figure 2).
For details on working with the contrast control, see Adjusting Contrast.
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TIP: Often, increased contrast will tend to make pictorials appear sharper. It is recommended that the sharpness control be used to adjust sharpness because it increases the sharpness of edges without having the macro tonal changes of the contrast control. |
Figure 1. A high-contrast image. Gray levels are being spread out across the entire histogram.
Figure 2. A low-contrast image. Gray levels are compressed into midtones, and there is a loss of highlight and shadow, as evidenced in the histogram.
© Copyright 2007
Xerox Corp.
All Rights Reserved.
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