Ricoh B291 Service Manual page 437

Photo Mode
Dithering or Error Diffusion for Photo Mode
Use SP4904 001 to select either dithering or error diffusion to process image fills
and halftones.
0: Selects the dithering and smoothing filter.
1: Selects the error diffusion and MTF filter.
Photo Mode Dithering: SP4904 001 = 0
If you select "0" for SP4904 001 to enable dithering halftones, only one SP code is
available for fine adjusting dithering.
SP4903 037 Smoothing Filter in Photo Mode
Photo Mode Error Diffusion: SP4904 001 = 1
If you select "1" for SP4904 001 to enable error diffusion, all the SP codes in the
Mode tables below (Text Mode, Text/Photo Mode, etc.) are available for
adjustment.
Use the master SP codes gross adjustment of the image processing mode after
you have set SP4904 001 = 1 for error diffusion. If you need to fine adjust a master
setting, set the master setting to "0" to access its slave SP codes.
Adjust the image for the Photo mode with the one master setting within its allowed
range (for the range, see Section "5. Service Tables"). To fine adjust the master
setting set it to "0" then perform the adjustments listed below.
SP4904 024 = 0
SP4903 036
SP4903 038
SP4903 091
SP4903 092
SP4903 093
SP4904 013
NOTE: An SP code number and name set in bold italic denotes an SSP (Special
Service Program) mode. To access an SSP, enter the SP mode: press and
hold down " on the 10-key pad then "Copy SP" on the touch-screen.
SM
CÓPIA NÃO CONTROLADA
Photo (General Quality)
Photo MTF (Edge)
Photo MTF (All)
Filter Strength: Photo (Edge)
Filter Adj.: Photo (Edge Det.)
Filter Adj.: Photo (Mag.%)
Halftone Adjustment: Edge Detection
6-35
CÓPIA NÃO CONTROLADA
IMAGE PROCESSING
B291/B295/B296/B297