IMAGE PROCESSING
2-29
SM A229
Detailed
Descriptions
Generation Copy Mode
The image processing for generation mode is basically the same as in text mode,
except that in order to prevent lines in the main scan direction from being
reproduced too thickly, line width correction is applied for the final gradation
treatment. Also, to reduce unwanted black dots, a weaker MTF filter is used; this
ensures that isolated dots do not get bigger, and are spread out. These dots will
then be deleted by the independent dot erase feature. This feature, however, is
kept at a low setting to ensure that important details such as dotted lines and
periods are not deleted.
With UP Mode (Copy Features – General Features – Original Mode Quality Level),
the user can select ‘Soft’, ‘Normal’, ‘Sharp’, and ‘SP Mode Changed’. The settings
of the SP modes indicated with an asterisk ( * ) are not used unless the user
selects ‘SP Mode Changed’.
Image Processing Path Related SP Modes
Input
Correction 1
SP4903-035 *
(Background Erase Level)
Input
Correction 2
SP4903-032
(Independent Dot Erase Level)
Filtering
SP4903-019 *
(MTF Filter Coefficient – Generation
Copy)
Magnification
SP2909-001
(Main Scan Magnification)
ID Control
Gradation
SP4904-6 *
(Line Width Correction Type)
Auto Shading
Background Erase
MTF
Main Scan
Magnification
γ Correction
Grayscale
Processing/Line Width
Correction
Independent Dot Erase
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