31 March, 1997
BIT SWITCHES
4-17
Service
Tables
BIT SWITCH A
Bit
Function
Comments
0
to
3
White threshold level
The greater the threshold, the darker the scanned
image.
Adjustable range: 6 to C
Notes
1. Do not set a value outside this range.
2. The settings of the white threshold (bits 0 to 3) and
black threshold (bits 4 to 7) must be the same.
B3 B2 B1 B0
Hexadecimal
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9
1
0
1
0
A
1
0
1
1
B
1
1
0
0
C
4
to
7
Black threshold level
Same as above.
BIT SWITCH B
Bit
Function
Comments
0
Halftone contrast
adjustment
0: Disabled
1: Enabled
If this bit is set to 1, halftone contrast can be adjusted
manually using bits 3 to 7 below.
1
Not used
2
Not used
3
to
7
Halftone contrast control
value
Bit switch B bit 0 should set to 1 before using these bits.
Bit 7 is a sign bit
If bit 7 = 0, the sign is plus (+)
If bit 7 = 1, the sign is minus (-)
b7 b6 b5 b4 b3
0
1
1
1
1 (+16) darken
0
1
1
1
0 (+15)
|
0
0
0
0
1 (+1)
0
0
0
0
0 (0)
1
1
1
1
1(-1)
1
1
1
1
0 (-2)
1
0
0
0
1 (-15)
|
1
0
0
0
0 (-16)
lighten
The larger the value, the darker the printed image.
