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A-61510 January 2005 4-13
Contrast % sets the image contrast by adjusting the difference
between black and white, thereby making an image sharper or softer.
Contrast is only available for binary images.
In a low-contrast setting, the difference between black and white is small,
so the image is softer. In a high-contrast setting, the difference between
black and white is large, so the image is clearer. Select a contrast value
from 1 to 100. The default is 50.
Contrast 0
Contrast 60
Contrast 100
Manual is always selected for binary images. Adjust the contrast
setting by dragging the Contrast sliding bar to the left or right to achieve
the desired Contrast setting. Scan the document to check the contrast.
Automatic not available for i800 Series Scanners.
Threshold thresholding is used to convert a gray scale image into a
binary (1 bit/pixel) image. The thresholding value ranges from 0 to 255.
The default is 90. A low threshold value will produce a lighter image, and
can be used to subdue backgrounds and subtle, unneeded information.
A high threshold value will produce a darker image, and can be used to
help pick up faint images.
Adjust the Threshold setting by dragging the Threshold sliding bar to the
left or right to achieve the desired Threshold setting. Scan the document
to check the threshold.
NOTE: This setting works with the Contrast setting. A Contrast setting
of 0 causes the scanner to use fixed thresholding. A Contrast
setting of 100 causes the scanner to use fully-adaptive
thresholding.