Canon CS-S 4.3 User Manual
Page 49
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49
Chapter 4
Scanning Devices
Note:
When changing the Paper Size setting, the preview area will
be cleared and all setting values are reset. When setting the
preview area size larger than the Paper Size, the preview area
size will be adjusted to the Paper Size.
Threshold Setting
The Threshold slider can be used to adjust the threshold value (the
demarcation between black and white) of black and white images. Images are
collection of data assigned varying brightness values. Grayscale and Color
images express the brightness with 8 or 12 bit values whereas Black and
White images express the brightness with only two values, black (0) and white
(255). Accordingly, a point has to be determined either black or white. This
point is called the threshold value. By changing the threshold value, you can
alter the appearance of image. The default setting is 128.
To adjust threshold value, drag the slider or input the value directly into the
box (click the box and type the number from 0 to 255) in FB1200S tab.
Descreen
Moiré patterns occasionally appear when items printed at high resolutions are
scanned. To reduce this phenomenon, scan photographs and other high-
resolution prints with the descreen activated. Deactivate descreen to scan
lower resolution items, such as newspapers, books and magazine text.
• The Descreen is unavailable when the scanning resolution is set for 601
dpi or more.
• Descreen returns to the previous setting when a scanning job is started
with a parent software application that cannot display the ScanGear
CS-S operation panel.