2-18
COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
CHAPTER 2 FUNCTION & OPERATION
3) Gamma Correction (1-dimension)
To improve the reproducibility of docu-
ments or modify the acquired image as
required by the user, it is possible to
convert the document image data using
conversion tables.
This machine provides various conversion
tables adjusted for image mode and set-
ting value.
However, there are several adjustment
items not available for image mode and
other conditions. For details, refer to the
driver software “Help” function.
The conversion tables below are for fun-
damental items and may be different from
actual items.
a) Brightness Adjustment
This adjusts the overall brightness of
the scanned image. The image
brightness increases as the setting
value becomes larger, and decreases
as the value becomes smaller.
For brightness adjustment in black and
white mode, refer to the “Binarizing”
section.
Y0
YH
White
(255)
After con
v
ersion
Before conversion
White
(255)
Black
(0)
(+)
(-)
YL
X0
Figure 2-506
b) Contrast Adjustment
This adjusts the contrast of the
scanned image. The image contrast
increases as the setting value be-
comes larger, and decreases as the
value becomes smaller.
Y0
White
(255)
White
(255)
Black
(0)
YH
X0
(+)
(-)
After con
v
ersion
Before conversion
YL
Figure 2-507
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