2-18 A-61627 November 2008
Black and White
Adjustment option
Black and White Adjustment — allows you to change the Contrast
and Threshold values. This option is only available if your Scan As
selection is Black and White.
• If you select Best (iThresholding) on the Scan As screen, only the
Contrast value can be changed.
• If you select Normal (ATP), both Contrast and Threshold can be
changed.
Contrast ⎯ adjusts the difference between black and white, thereby
making an image sharper or softer. 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.
Threshold — converts a grayscale image to a black and white image.
The thresholding values range from 0 to 255. The default is 90. A low
threshold value produces a lighter image, and can be used to subdue
backgrounds and subtle, unneeded information. A high threshold value
produces a darker image, and can be used to help pick up faint images.
1. When you select Contrast or Threshold, the Contrast (or
Threshold) screen will be displayed:
2. Use the Up and Down arrows to adjust the value, then click the
button to the left of the number to save the new value.
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