Ricoh B082 Service Manual page 356

IMAGE PROCESSING
Text/Photo Mode
Text/Photo mode achieves high quality reproduction of pictures with accurate
grayscaling. Processing is conducted with the special γ coefficient which
reproduces a wide range of grayscale. Compared with the Text mode, text
reproduced in the Text/Photo mode appears lighter and textured backgrounds
could appear on copies, but the incidence of moiré is reduced with edge detection
filter. Because Photo Priority uses an MTF filter weaker than that of the Normal
setting, the quality of the image is improved with the elimination of moiré. The Text
Priority selection uses an MTF filter stronger than that of the Normal setting, thus
increasing the sharpness of lines.
Scanner Image
Correction
Pre-Filter
Processing
Magnification
Filter Processing
Density Control
Grayscale
Processing
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.
B079/B082
Image Processing Flow
Shading Correction
!
Background Erase
!
Pre-Filter Smoothing
!
Main Scan Direction
!
Independent Dot Erase
!
MTF Correction
!
γ Coefficient
!
Error Diffusion
Related SP Modes
SP4903 67 (Background Erase Level:
Text/Photo Mode)
SP4903 13 (Pre-Filter: Text/Photo)
SP2909 1 (Main Scan Magnification)
SP4903 62 (Independent Dot Erase Level)
SP4904 25~28 Text/Photo (General) Quality
(!"Text Photo Mode", pg.6-34)
6-24 SM