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(v13) Variation in currentscreen

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

The RIP does not quite follow the documented behavior of currentscreen: instead of pushing arbitrary values and a halftone dictionary when the current screen was set up using sethalftone, the RIP pushes the actual frequency and angle of the black screen taken from the halftone dictionary, just as for a screen set up with setscreen.

The RIP differs from Adobe’s Apple LaserWriter implementation of PostScript Level 2 (and probably others) which always use sethalftone to set up the default screen. (GGS thinks that Adobe’s implementation in this respect could cause compatibility problems with a few Level 1 jobs.) The RIP generally still sets up the default screen with setscreen, but sometimes with sethalftone or setcolorscreen, according to circumstances (such as whether the RIP is doing automatic separation).

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