(v13) Calibration groups and bump-up curves for flexographic printing

This page applies to Harlequin v13.1r0 and later; and to Harlequin Core but not Harlequin MultiRIP.

In flexographic printing it is often important to ensure that the screening specified within a job is applied, using different screens for different objects within the file. This implies a need to apply different calibration for those different objects, based on the screening that's used. Harlequin Core v4.1r1 introduces the idea of calibration groups. Each calibration set can be allocated to a group; if not explicitly allocated, they are in the Default group.

When calibration groups are in effect, the RIP selects the best calibration set from the group to use for each object and colorant channel on the page, based on comparing the Warnings / Selection Criteria settings for the calibration sets to the properties of each object.

The Harlequin MultiRIP has had the ability to apply special handling to the shadow end of the tone curve in calibration for many years. The introduction of Harlequin Core v4.1r1 adds the ability to control the highlights as well. This is only available for a press curve (actual or intended). You may choose to use an actual press curve based on a linear press specifically to apply a bump-up curve.

HqnPushCalibration procedure is updated to handle calibration groups.