Xerox DocuMate 4790 Benutzerhandbuch Seite 145

Scanning from TWAIN and WIA
Technical note:
Most monitors have a gamma setting that is user adjustable. When viewing scanned images on-screen, versus
printing the image, the gamma setting of the monitor may affect how light or dark the scanned image looks
when compared to the original. If the scanned image is too different from the original image, or if adjusting the
scanned gamma level does not modify the image how you want, try adjusting the monitor's gamma level. Refer
to the monitor's user guide for adjusting the gamma level and see if the manufacturer has any recommended
settings.
Invert Image
The Invert image option reverses the color of each pixel in the scanned image.
When scanning in black and white, each pixel is reversed from black to white and white to black. When scanning
in grayscale each pixel is reversed to the opposite level of gray. When scanning in color each pixel is reversed to
the opposite color in the color wheel.
For example, you might choose this option if you are scanning pages that have been printed from newspaper
microfilm. Newspaper microfilm reverses black and white so that when viewed on a monitor, the text is white and
the paper is black.
The following example shows the original grayscale image and the inverted image.
The following example shows the original color image and the inverted image.
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Xerox ® DocuMate ® 4790
User's Guide