Gestetner A294 Service Manual page 75

Rev. 2/2000
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/Document Server Features – General Features – Original
Mode 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 Service Mode.
Input
Correction 1
Input
Correction 2
Filtering
Magnification
ID Control
Gradation
SM
CÓPIA NÃO CONTROLADA
Image Processing Path
Auto Shading
Background Erase
Independent Dot Erase
MTF
Main Scan Magnification
γ Correction
Grayscale Processing/
Line Width Correction
2-25
CÓPIA NÃO CONTROLADA
IMAGE PROCESSING
Related SP Modes
•
SP4903-069 *
(Scanner Gamma Thresh Level)
•
SP4903-074 *
(Background Erase Level)
•
SP4903-064
(Independent Dot Erase Level)
•
SP4903-016 *
(Pre Filter Coefficient)
•
SP4903-057 to 058 *
(MTF Filter Coefficient –
Generation Copy)
•
SP2909-001
(Main Scan Magnification)
•
SP4903-75 to 77*, SP4904-24
(Line Width Correction Type)
A294/A295