Ricoh A-C2 - Photo Mode

IMAGE PROCESSING 26 January, 2001
6-24
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.
Image Processing Flow Related SP Modes
Scanner Image
Correction
Shading Correction
!
Pre-Entry
Processing
Background Erase SP4-903-66 (Background Erase Level)
!
Smoothing SP4-903-12 (Pre-Filter Coefficient)
!
Magnification Main Scan Direction SP2-909-01 (Main Scan Magnification)
!
Independent Dot Erase Not done in Photo mode
!
Filter
Processing MTF Correction
SP4-903-09 (Filter Selection)
SP4-903-37 (Smoothing Filter Coefficient)
SP4-903-36 (MTF Filter Coefficient)
SP4-903-38 (MTF Filter Strength)
!
Density Control
γ Coefficient
!
Grayscale
Processing
Dither/Error Diffusion SP4-904-02 (Photo Mode Image Quality
Processing – Dither Matrix Type)