26 January, 2001 IMAGE PROCESSING
6-23
Detailed
Descriptions
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 could appear lighter and textured backgrounds
could appear on copies, but the incidence of moiré is reduced by the employment
of a weak MTF 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-Entry
Processing
Background Erase SP4-903-67 (Background Erase Level)
!
Smoothing SP4-903-13 (Pre-Filter Coefficient 25%~64%)
SP4-903-14 (Pre-Filter Coefficient 65%~154%)
!
Magnification Main Scan Direction SP2-909-01 (Main Scan Magnification)
!
Independent Dot Erase SP4-903-62 (Independent Dot Erase Level)
!
Filter Processing MTF Correction SP4-903-39~54 (MTF Filter Coefficients,
Strength)
!
Density Control
γ Coefficient
!
Grayscale
Processing
Error Diffusion SP4-904-07 (Error Diffusion Pattern)
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