Ricoh A-C4, Руководство по обслуживанию

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IMAGE PROCESSING 20 June 2005
6-24
6.5.7 IMAGE PROCESSING STEPS AND RELATED SP MODES
Text Mode
The Text mode achieves quality reproduction of text and sharp lines and ignores
background texture. Processing is conducted with a high resolution MTF filter;
special processing with the
γ
coefficient prevents background reproduction and
achieves the best reproduction of images with error diffusion. Because the Soft and
Normal settings use a weak MTF filter, the quality of the image is improved with the
elimination of moiré. The Sharp 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
Ð
Pre-Filter
Processing
Background Erase
SP4903 65 (Background Erase Level: Text Mode)
Ð
Pre-Filter Smoothing SP4903 10 (Pre-Filter: Text)
Ð
Magnification Main Scan Direction SP2909 1 (Main Scan Magnification)
Ð
Independent Dot Erase SP4903 60 (Independent Dot Erase: Text Mode)
Ð
Filter Processing MTF Correction SP4904 20~23 Text (General Quality) ( 0)
Ð
Density Control
γ
Coefficient
Ð
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.