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HP Designjet 50ps Printer - Overprint Versus Underprint

Definition of Overprint
Usually objects (text, images, graphics) laying on top of each other are printed, the objects in the background will be knocked out:
Figure : Underprint
This is the usually way to work since prevents alterations to the color as a result of the background and foreground colors being mixed.
Overprint in JobStream allows mixing foreground and background colors so that flashes are allowed. As a rule, black text should be always be overprinted.
    Figure : Overprint
  1. Black Text Over Print
  2. Orange Color Overprint
There are some applications that have overprint features (Quark, Illustrator, …) and some with different cases that the one we have seen here but there are others that does not have this capabilities. Check in each case.

A Use of Overprint

Apart of highlight the text over the background, Overprint can be used also to precisely reproduce Color Gradients.
If you do Color Gradients (with Overprinting option to ON) the 50ps will mix colors. If you have only one color, this color will be mixed with its background (White)
This also applies for Spot Colors

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