Ricoh B286 Service Manual page 350

SP4-xxx Scanner
4565 Scanner: Line Drawing
These SP's set the MTF (Modular Transfer Function) for line drawing originals.
! Always adjust the level (coefficient) before adjusting the strength.
! Raising the brightness or contrast level may increase moiré
Note: When the original image is converted to electrical signals, the contrast is
reduced due to the influence that adjacent white and black pixels have on one
another as a result of CIS properties. Typically, you will see very narrow width
and spacing between black and white areas. MTF corrects this problem and
emphasizes image detail.
MTF Filter Level: Main
1
Scan:0-15
MTF Filter Level: Sub
2
Scan:0-15
MTF Filter Strength: Main
3
Scan:0-7
MTF Filter Strength: Sub
4
Scan:0-7
6 Smoothing Filter:0-7
7 Brightness:1-255
8 Contrast:1-255
9 Independent Dot Erase:0-7
B286/B289
Set the MTF coefficient for main/sub scanning.
[0 to 15/8/1]
0: Weak < 8: Default > 15: Strong
Set the MTF strength for main/sub scan
directions.
[0 to 7/4/1]
0: Weak ← 4: Default → 7: Strong
Selects the level of smoothing for originals that
contain dithered images.
[0 to 7/0/1]
0: Default (Off) > 7: Strong
Sets the overall brightness of the image.
[1 to 255/128/1]
1: Weak < 128: Default > 255: Strong
Sets the overall contrast of the image.
[1 to 255/128/1]
1: Weak < 128: Default > 255: Strong
Sets the level of independent dot erasure to
improve the appearance of background.
[0 to 7/0/1] 0: Default (Off) → 7: Strongest
5-80 SM