Service manual

b. ADS (Auto Image Density Selection)
In ADS, the user does not set the threshold; the machine calculates it,
guided by input from the user (there are 4 settings for each mode: B/W or
F/C).
In full color mode, after the first scanning (Bk) the machine calculates the
threshold for removing background by referring to the RGB data taken from
the whole of the original.
In black and white mode, the machine calculates the threshold for each pixel
by referring to neighboring pixels.
(3) Color Conversion
RGB video signals from each scanning cycle are converted to YMCK video
signals using a matrix. The contents of the matrix depend on the selected
modes. The transparency of each color toner is not ideal, as shown above.
Color conversion compensates for the difference between ideal and actual
characteristics.
The following modes affect the matrix operation:
Color conversion mode, Pastel mode, Color balance mode, Original mode
(Printed Photo, Glossy Photo, Copied Photo), RGB toner correction mode.
Detailed
Section
Descriptions
IMAGE PROCESSING
SM 2-51 A166/A187/A189
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA