Gestetner A294 Service Manual page 74

IMAGE PROCESSING
Pale Mode
The image processing for pale mode is basically the same as in text mode.
However, the contrast of the original is low. So, to preserve details, a stronger MTF
filter is used. Also, the independent dot erase level is set at a lower level, so that
only the faintest of dots are deleted; this ensures that 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
A294/A295
CÓPIA NÃO CONTROLADA
Image Processing Path
Auto Shading
Background Erase
Independent Dot Erase
MTF
Main Scan Magnification
γ Correction
Grayscale Processing/
Line Width Correction
2-24
CÓPIA NÃO CONTROLADA
Related SP Modes
•
SP4903-068 *
(Scanner Gamma Thresh Level)
•
SP4903-73 *
(Background Erase Level)
•
SP4903-063
(Independent Dot Erase Level)
•
SP4903-015 *
(Pre Filter)
•
SP4903-055 to 056 *
(MTF Filter Coefficient – Pale
Originals)
•
SP2909-001
(Main Scan Magnification)
•
SP4904-23
(Line Width Correction Type)
Rev. 2/2000
SM