Photo Mode - Gestetner B003 Service Manual

IMAGE PROCESSING

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
Scanner Image
Correction
Pre-Entry
Processing
Magnification
Independent Dot Erase
Filter
Processing
Density Control
Grayscale
Processing
B003/B004/B06/B007
Shading Correction
!
Background Erase
!
Smoothing
!
Main Scan Direction
!
!
MTF Correction
!
γ Coefficient
!
Dither/Error Diffusion
Related SP Modes
SP4-903-66 (Background Erase Level)
SP4-903-12 (Pre-Filter Coefficient)
SP2-909-01 (Main Scan Magnification)
Not done in Photo mode
SP4-903-09 (Filter Selection)
SP4-903-37 (Smoothing Filter Coefficient)
SP4-903-36 (MTF Filter Coefficient)
SP4-903-38 (MTF Filter Strength)
SP4-904-02 (Photo Mode Image Quality
Processing – Dither Matrix Type)
6-24 SM