Canon CanoScan FB 1200S Printing Guide - Page 52

Scanning Devices, Adjusting Threshold Setting, Selecting the Descreen

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CONTENTS GLOSSARY INDEX Chapter 4 Scanning Devices 52 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. Adjusting 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. Selecting the Descreen Moiré patterns occasionally appear when items printed at high resolutions are scanned. To reduce this phenomenon, scan photographs and other highresolution prints with the descreen activated. Shut it off to scan lower resolution items, such as newspapers, books and magazine text. The default setting is "Off." • 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. 52

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CONTENTS
GLOSSARY
INDEX
52
52
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.
Adjusting 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.
Selecting the 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. Shut it off to scan lower
resolution items, such as newspapers, books and magazine text. The default
setting is "Off."
•
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.