Minolta CF910 Service Manual page 47

Masking
Considering the spectral transmission characteristics of the R, G, and B filters of the CCD
Sensor and the spectral reflection characteristics of the toner, the image data is corrected
and the DR, DG, and DB data are replaced with C, M, and Y data, thereby enabling color
reproduction faithful to the original.
UCR and BP
• In UCR, or Under Color Removal, the C, M, and Y data required for color reproduction
areas are retained, while the C, M, and Y data of gray areas are removed.
• With BP, or Black Paint, a certain ratio of the gray area is replaced with K data, the ratio
varying depending on the saturation of the color.
255
0
Because of the spectral reflection characteristics of the toner, simply placing C, M, and Y
toner one on top of the other does not make a pure black.
M
Y
C
UCR
M-30
255
M
Y
C
0
Bk
1154M086AA