System information

Simple logic tells us to combine the inks, so we expect the following result:
ResultCircle in the foregroundCircle in the backgroundInk
40 %0 %40 %Cyan
0 %0 %0 %Magenta
60 %60 %0 %Yellow
0 %0 %0 %Black
In practice, however, the result depends on the selected overprint mode:
Illustrator overprint mode (OPM 1)Standard overprint mode (OPM 0)
Preview
Resulting color in
the intersection
C: 40 %C: 0 %
M: 0 %M: 0 %
Y: 60 %Y: 60 %
K: 0 %K: 0 %
11.3 Common pitfalls of overprint behavior
Overprint depends on the combination of object type (text, line art, image...), color space (CMYK,
RGB, Gray...) and overprint mode (OPM 0 or OPM 1). Consequently, there are some common pitfalls
associated with the overprint behavior of inks. The following examples illustrate these pitfalls:
Example1: CMYK object with standard overprint mode on spot color background
Given a CMYK object that is rendered with standard overprint mode (OPM 0) on top of a background
in the spot color Red.
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