COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
2-21
CHAPTER 2 FUNCTION & OPERATION
5) Binarizing
a) Simple Binarizing
Binary image data can only express
picture elements as either “black” or
“white.”
In order to separate the picture ele-
ments into black and white, signals
corresponding to the image brightness
must be cut off at a certain level, so that
anything above that level is judged as
“white” and anything below as “black.”
This is called simple binarizing. This is
useful for text documents. Simple bi-
narizing for this machine is called
“Black and White” mode.
The level at which picture elements are
to be divided into white or black is
called the “slice level.” The image
brightness is adjusted by changing this
slice level.
Black
1 picture element
White
Slice level
Document
Output
White 255
Black 0
160
128
96
Figure 2-511
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