Ricoh B264 Service Manual page 287

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 (Not Used)
4552 7 Contrast (Not Used)
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
SERVICE PROGRAM MODE TABLES
Set the MTF coefficient for main/sub scan
directions.
[0~15/8/1]
0: Weakest 8: Default
Set the MTF strength for main/sub scan
directions.
[0~7/4/1]
0: Weakest 4: Default
Selects the level of smoothing.
[0~7/0/1]
0: Default (Off) 7: Strongest
Sets the overall brightness of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the overall contrast of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the level of independent dot erasure to
improve the appearance of background.
[0~7/0/1]
0: Default (Off) 7: Strongest
5-23
1
) for Text/Photo mode.
15: Strongest
7: Strongest
255: Strongest
255: Strongest
B264/B265