System information

OverprintKnockout
Yellow plate
Resulting color in
the intersection
C: 40 %C: 0 %
M: 0 %M: 0 %
Y: 60 %Y: 60 %
K: 0 %K: 0 %
Different colors, common inks
An important thing to remember when talking about overprint is the concept of “common inks”,
meaning inks which the background and the foreground objects have “in common”. We talk about
inks, not colors, because the overprint and knockout concepts are relevant in print only, not when
you view the PDF documents on screen.
The principle here is as follows: If there are common inks, the foreground inks win, even if their
tint value is lower than the corresponding one of the background ink.
Suppose you have a CMYK object set to overprint on a spot color background. Their inks are as
follows:
Foreground objectBackground objectInk
100 %Cyan
0 %Magenta
0 %Yellow
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