•Faded pictures or old documents with faded text - 60% to 70%
•Light colored carbon copy paper, such as yellow or pale pink or pale green, with light text - 45% to 55%
•Newspaper or magazine pages - 55% to 70%
•Book pages - 60% to 75%
•Pictures taken inside or in the shade - 40% to 60%
Color image contrast examples
The examples below show the original image at the default setting of 50% contrast level, 25% contrast and 75% contrast.
Contrast: 25% | Contrast: 50% | Contrast: 75% |
Technical note:
Most monitors have a contrast setting that is user adjustable. When viewing scanned images
Black background scanners:
Some scanners have a black background plate. A black background results in more precise cropping results and skew detection. However, when scanning thin paper, such as carbon copy paper or ruled writing paper, which are less than 18lb paper weight, the background may “bleed” through into the final image and make the image darker than it should be. In that case, try adjusting the brightness level between 40% and 60%, then adjust the contrast level between 60% and 80%.
Gamma
Gamma is the tone curve and starting point for image enhancement. Move the slider left or right to darken or lighten the image. As you raise or lower the Gamma value, the values at which Brightness and Contrast affect the image are changed. It is recommended that you keep the default gamma value, or adjust this setting before adjusting the other options.
Choosing gamma values
As the gamma value is adjusted lower, the tone curve begins to straighten and the shadows of the image are expanded, darkening the shadows without overall darkening the image with gray as seen with lowering the brightness level. This way, the highlights and shadows in the image are maintained by saturating the pixels with darker levels of the same color rather than adding gray to all colors.
Xerox® DocuMate® 4830 | 165 |
User’s Guide |
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