2-18
A-61627 June 2010
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.
