Ricoh B291 - Text;Photo Mode

IMAGE PROCESSING
SM 6-25 B291/B295/B296/B297
Detailed
Descriptions
Text/Photo Mode
Text/Photo mode achieves high quality reproduction of pictures with accurate gray
scaling. 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 and 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.
Image Processing Flow Related SP Modes
Scanner Image
Correction
Shading Correction
!
Pre-Filter
Processing
Background Erase
SP4903 67 (Background Erase Level:
Text/Photo Mode)
!
Pre-Filter Smoothing
SP4903 13 (Pre-Filter: Text/Photo)
!
Magnification Main Scan Direction SP2909 1 (Main Scan Magnification)
!
Independent Dot Erase SP4903 62 (Independent Dot Erase Level)
!
Filter Processing MTF Correction SP4904 25~28 Text/Photo (General) Quality
(!”Text Photo Mode”, pg.6-36)
!
Density Control
γ Coefficient
!
Grayscale
Processing
Error Diffusion
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.
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA