Gestetner B147, Service Manual

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IMAGE PROCESSING
B147/B149/B190 6-32 SM
Color Conversion
Transparency for each color toner is not ideal. Color conversion compensates for
the differences between the ideal and actual characteristics. A matrix converts the
RGB video signals into CMYK video signals while the original is scanned once.
Conversion Matrix
The following color conversion table is an example of the results from the matrix
operation.
• Simple color copying.
•
No special modes applied.
•
To represent green, the yellow and cyan toners are used in a 1:1 ratio.
Color Conversion Table
Original Color
Toner
K R Y G C B M W
Y 1 1 1 1 0 0 0 0
M 1 1 0 0 0 1 1 0
C 1 0 0 1 1 1 0 0
K 1 0 0 0 0 0 0 0
User Program Mode
When the user selects one of the following special modes, the values in this table
may fall between 0 and 1.
Photo mode
•
Glossy Photo
•
Printed Photo
• Copied Photo
Others
•
Generation Mode
•
Pale Mode
•
Map Mode
Two-color mode
•
Separates black areas and colored areas.
•
Converts black areas to a color selected by the user.
• All other areas are converted to a second color selected by the user.
(
the operator's manual for details)