Ricoh B286, Service Manual

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SP4-xxx Scanner
B286/B289 5-78 SM
4553 Scanner: Text/Photo
These SP’s set the MTF (Modular Transfer Function) for originals with text and
photos on the same area.
! 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.
1 MTF Filter Level: Main Scan:0-15
2 MTF Filter Level: Sub Scan:0-15
Set the MTF coefficient for main/sub
scanning.
[0 to 15/8/1]
0: Weak < 8: Default > 15: Strong
3
MTF Filter Strength: Main
Scan:0-7
4 MTF Filter Strength: Sub Scan:0-7
Set the MTF strength for main/sub scan
directions.
[0 to 7/4/1]
0: Weak
←
4: Default
→
7: Strong
6 Smoothing Filter:0-7
Selects the level of smoothing for originals
that contain dithered images.
[0 to 7/0/1]
0: Default (Off) > 7: Strong
7 Brightness:1-255
Sets the overall brightness of the image.
[1 to 255/128/1]
1: Weak < 128: Default > 255: Strong
8 Contrast:1-255
Sets the overall contrast of the image.
[1 to 255/128/1]
1: Weak < 128: Default > 255: Strong
9 Independent Dot Erase:0-7
Sets the level of independent dot erasure to
improve the appearance of background.
[0 to 7/0/1] 0: Default (Off)
→
7: Strongest