Overprint handling is a feature in the ColorConvert section of the process template that helps to prevent overprinting objects from generating unintended knockouts. You can apply overprint handling in the refine, loose page output, and imposition output process templates.
The following examples show the effects of using overprint handling.
Example 1: All colors are shared
Figure 1. The desired overprint effect
Figure 2. The outcome without and with overprint handling
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.