Ricoh A229 Service Manual page 83

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'.
Input
Correction 1
Input
Correction 2
Filtering
Magnification
ID Control
Gradation
SM
Image Processing Path
Auto Shading
Background Erase
Independent Dot Erase
MTF
Main Scan
Magnification
γ Correction
Grayscale
Processing/Line Width
Correction
2-29
IMAGE PROCESSING
Related SP Modes
SP4903-035 *
(Background Erase Level)
SP4903-032
(Independent Dot Erase Level)
SP4903-019 *
(MTF Filter Coefficient – Generation
Copy)
SP2909-001
(Main Scan Magnification)
SP4904-6 *
(Line Width Correction Type)
A229