Ricoh Aficio MP 3500 Series, Service Manual

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IMAGE PROCESSING
B291/B295/B296/B297 6-26 SM
Photo Mode
Photo mode emphasizes grayscale processing to achieve the best possible
reproduction of photographs and eliminate moiré by using the highest density and
γ
coefficient in the reproduction of grayscales and dithering. Print Photo performs
smoothing and dithering for photos copied from magazines, newspapers, etc. The
Normal selection uses a higher resolution setting and employs error diffusion but
does not use smoothing to improve the appearance of text in photographs. Glossy
photo paper employs MTF filter processing and error diffusion to copy glossy or
matte photographs and achieves a low incidence of moiré, thus reproducing copies
of photographs of high resolution.
For photo mode, the features used depend on which type of gray scale processing
has been selected for Photo mode (either ‘dithering and smoothing’ or ‘error
diffusion and MTF’); this depends on the setting of SP 4904 001. Details are
explained later in this section.
Image Processing Flow Related SP Modes
Scanner Image
Correction Shading Correction
!
Pre-Filter
Processing
Background Erase
SP4903 66 (Background Erase Level: Photo
Mode)
!
Pre-Filter Smoothing SP4903 12 (Pre-Filter: Photo Mode)
!
Magnification Main Scan Direction SP2909 1 (Main Scan Magnification)
!
Filter
Processing Smoothing/MTF
Correction
SP4904 024 Photo (General Quality) (
!
pg. 6-35)
!
Density Control γ
Coefficient
!
Grayscale
Processing Dither/Error Diffusion SP4904 2 (Quality Photo Mode)
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