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A-61517 October 2004 4-15
• 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 i100 Series Scanners.
Threshold thresholding is used to convert a grayscale 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.
200 dpi; 80 Threshold; 20 Contrast 200 dpi; 80 Threshold; 100 Contrast
Lighten, Normal and Darken are used as quick sets to adjust the
threshold. Lighten = 72, Normal = 90 and Darken = 128.