Example 2: Some shared, some unshared colors
Figure 3: The desired overprint effect
Figure 4: The outcome without and with overprint handling
Multiplicative blend formula
Prinergy uses the following formula to calculate the proper channel
color amount for the intersecting area of overprinting objects:
1 - (1 - Color1) x (1 - Color2) = multiplicative blended amount
where Color1 and Color2 are the underlying and overprinting amounts
of a shared channel color. For example, if 70% magenta and 10%
magenta were used, then Color1 and Color2 would be 0.7 and 0.1.
About overprint handling
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