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24 February, 1999
IMAGE PROCESSING
A. Color conversion mode
Color conversion mode is a user feature, not to be confused with color conversion
(RGB to CMYK) described above. In color conversion mode, a selected color
(C/M/Y/R/G/B/K/W) on an original that falls within the recognized thresholds for that
color is converted into a different color on the copy. Up to 4 colors can be
converted at one time. Convertible colors include C/M/Y/R/G/B/K/W/Yellow
Green/Orange/Marine Blue/Beige/Pink/Purple, and 15 user colors (the user colors
are for A259/A260 only). Changing the matrix parameters enables color conversion
to occur.
For example, when changing Yellow to Black, the coefficients for the Yellow video
signal in the color conversion table become: Y: 1, M: 1, C: 1, Bk: 1
B. Pastel mode
In pastel mode, the matrix parameters change, and the output of the combined
YMCK data shifts to a value between 100 % and 25 %. There are 9 steps, and the
value used depends on the user's selection.
C. Color balance mode
In color balance mode, the data output for each color (YMCK) can be changed
independently by changing the matrix parameters. There are nine possible values
for each color.
D. Original mode
There are three modes within photo mode (Press Print, Glossy Photo, and 2nd
Generation) and three types of special original mode (Marker Pen, Inkjet, Map).
The machine selects the most suitable matrix for the original type that is selected
by the user at the operation panel.
For inkjet mode, the user can select one of three different inkjet gamma (γ) tables
to emulate the output of three different types of inkjet printer. (This is done with the
User Tools.)
E. RGB toner correction mode
The toner mixing ratios for R, G, and B are adjustable (SP 5-611-001 to 5-611-
006). The adjustments are valid for 2C (R, G, or B) copy mode only.
F. Twin color mode
Twin color mode separates black areas and colored areas. The machine then
converts black to one color (that was selected by the user) and all the color areas
another color(also selected by the user) so the output has only two colors. For
A258, there are 12 selectable colors. For the A259/A260, there are 15 user colors
in addition to this.
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