Xerox DocuMate 152i, Руководство по сканированию

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TWAIN Scanning Guide Image Enhancements
46 User’s Guide
• Sharpen —sharpens the appearance of the image by evaluating a pixel and changing its
color to increase the contrast to adjacent pixels. Use the Radius field to set the size of the
area for each pixel to be evaluated to adjacent pixels. Note that the higher the number is in
the Radius field, the longer it will take the driver to evaluate the image
• Unsharp mask —adjusts the contrast of edge detail by evaluating the image and setting a
lighter and darker line on either side of the edge. Use the Sensitivity slider to adjust the
tolerance of the unsharp mask.
Moiré Reduction
Moiré patterns are wavy or rippled lines that may appear in the scanned images of newspapers
and magazines, and sometimes scanned images of photos, line drawings, and color scans of
textured paper. Select the
Moiré reduction option to have the driver attempt to find and remove
moiré patterns from the image. Please note that when Moiré reduction is enabled the scanner
may scan slower as the image is checked for moiré patterns. This option is only available when
scanning in
Color or Gray .
Moiré radius —you can set the size of the area to be evaluated in the Moiré radius field. Adjusting
the radius will produce different results for the various types of items that can be scanned. With
this feature, you may have to test scan a few times, adjusting the Moiré radius as needed, until
you obtain the best results for the type of paper in your scan job. Note that the higher the number
is in the Moiré radius field, the longer it will take the driver to evaluate the image.
White Level
With this option you can set what the scanner should interpret as “white” in the final image, even
though the page being scanned may have a shaded or off-white background. You may want to
adjust this option to have the image automatically corrected when you are scanning irregular
paper, such as thick or thin paper, that may cause the white page in the final image to appear
shaded with a pale gray.
For the best automatic results you can simply select the type of paper you are scanning from the
list. Alternatively, you can input a number in the Custom value field. The value you set in this field
can be from 128 to 255. If you set the custom value to 128 you are telling the scanner that all
pixels that are gray level 128 or higher (lighter) should be changed to white in the final image. If
you set the custom value to 255, you are telling the scanner that only pure white is white and
anything lower than 255 should remain unchanged in the final image.
Image with moiré patterns Image with moiré patterns removed