HP PCL 5 User Manual Page 79

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EN The PCL Print Model 5-15
Table 5-1. RGB ROP Truth Tables
ROPs in the CMY Color Space
The CMY ROP truth tables in Table 5-2 shows examples of how the
ROPs number determines the value of the Destination for all
combinations of Texture, Source, and Destination. In the CMY color
space a “0” is the absence of ink (white) and a “1” is the presence of
ink (black), the opposite of the RGB color space value for black and
white. Therefore, the ROPs results (Destination values) for the CMY
color space are the opposite (negation) of the RGB values. However,
a CMY ROP is easier to use when determining if the page is marked,
since a “1” denotes marking.
ROP
rgb
252 ROP
rgb
90 ROP
rgb
n
(11111100) (01011010) n=(b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
)
TSDD TSDD TSDROP n D
1111
white
1110
white
111b
7
b
7
1101 1101 110b
6
b
6
1011 1010 101b
5
b
5
1001 1001 100b
4
b
4
0111 0111 011b
3
b
3
0101 0100 010b
2
b
2
0010 0011 001b
1
b
1
0000
black
0000
black
000b
0
b
0
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