(v13) Overprinting solid black

This page applies to Harlequin v13.1r0 and later; both Harlequin Core and Harlequin MultiRIP.

The Harlequin RIP has the ability to overprint solid black objects, irrespective of the value of setoverprint. This is done using the user parameter OverprintBlack. Like all user parameters, OverprintBlack is set with setuserparams.

OverprintBlack only operates on solid black linework and text when the output device is CMYK. It does not operate on images or shadings, nor does it operate on rich blacks or on blacks specified in ICCBased color spaces. The following are considered to be solid black:

            0 0 0 1 setcmykcolor
            0 setgray

and also operates on setrgbcolor and named colors when these are converted to solid black. A common use case is to avoid misregistration errors with black text and linework.