Ricoh B291 Service Manual page 283

4552* Scanner: Text/Photo
These SP codes set the MTF (Modular Transfer Function*
Note:
• As a general rule, adjust the level (coefficient) before adjusting the strength.
• Raising the brightness or contrast level may increase the occurrence of moiré
4552 1 MTF Filter Level: Main Scan
4552 2 MTF Filter Level: Sub Scan
4552 3 MTF Filter Strength: Main Scan
4552 4 MTF Filter Strength: Sub Scan
4552 5 Smoothing Filter
4552 6 Brightness
4552 7 Contrast
4552 8 Isolated Dot Removal
*1 When the CCD converts the original image 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 lens
properties. Typically, you will see very narrow width and spacing between black and white areas.
MTF corrects this problem and emphasizes image detail.
SM
CÓPIA NÃO CONTROLADA
SERVICE PROGRAM MODE TABLES
Set the MTF coefficient for main/sub scan
directions.
[0~15/8/1]
0: Weakest
Set the MTF strength for main/sub scan
directions.
[0~7/4/1]
0: Weakest
Selects the level of smoothing.
[0~7/0/1]
0: Default (Off)
Sets the overall brightness of the image.
[1~255/128/1]
1: Weakest
Sets the overall contrast of the image.
[1~255/128/1]
1: Weakest
Sets the level of independent dot erasure to
improve the appearance of background.
[0~7/0/1]
0: Default (Off)
5-23
CÓPIA NÃO CONTROLADA
1
) for Text/Photo mode.
15: Strongest
8: Default
7: Strongest
4: Default
7: Strongest
255: Strongest
128: Default
255: Strongest
128: Default
7: Strongest
B291/B295/B296/B297