Ricoh B291 Service Manual page 285

4556* Scanner Grey Scale
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
4556 1 MTF Filter Level: Main Scan
4556 2 MTF Filter Level: Sub Scan
4556 3 MTF Filter Strength: Main Scan
4556 4 MTF Filter Strength: Sub Scan
4556 5 Smoothing Filter
4556 6 Brightness
4556 7 Contrast
4556 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.
4600* SBU Version
This SP displays the ID code of the SBU. This is an 8-byte display. Bytes 3 to 0
are fixed (0010). Bytes 7 to 4 display the ID code of the SBU.
4605* Scanner Adjustment
Use these SP codes to 1) display the status of the white level peak adjustment for
the SBU, and 2) do the adjustment manually.
4605 1* Flag Display
4605 2* Start
4605 3* Flag Reset
SM
CÓPIA NÃO CONTROLADA
SERVICE PROGRAM MODE TABLES
Set the MTF coefficient for main/sub scan
directions.
[0~15/0/1]
0: Weakest
Set the MTF strength for main/sub scan
directions.
[0~7/0/1]
0: Default (Off)
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)
Displays the status of standard white plate density adjustment:
1: White level peak density adjusted
0: White level peak density not adjusted
Sets the machine in the standard white plate density adjustment
mode (a message is displayed on the LCD). Place a T6200 text
chart on the exposure glass and press [1] to do the white level
peak density adjustment with the standard white plate. After
execution a message tells you whether the adjustment
succeeded or not.
0: Off
1: On
Resets the flag that indicates the status of the standard white
plate density adjustment.
5-25
CÓPIA NÃO CONTROLADA
1
) for Grayscale..
8: Default 15: Strongest
7: Strongest
7: Strongest
255: Strongest
128: Default
255: Strongest
128: Default
7: Strongest
B291/B295/B296/B297