Interception re-purposing of jobs for different output devices

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

The next most straightforward workflow is where jobs are designed for one press, but printed on a different press. It is commonly used on digital presses when printing jobs designed for a conventional press. This re-purposing of pages is one of the main selling points of the ICC color management model. This workflow is handled by treating standard device color spaces as though they were painted in an /ICCBased color space. The example configuration is shown in Figure: Re-purposing for digital press:

CODE

<<
  /DeviceCMYK [ /ICCBased (iccprofiles/SWOP.icc) (r) file ]
  /DeviceRGB [ /ICCBased (iccprofiles/sRGB.icc) (r) file ]
>> setinterceptcolorspace
<<
  /Profile (iccprofiles/Digital.icc) (r) file
>> setreproduction

As suggested by the profile names, the job contains CMYK pages for a SWOP press which are going to be printed on a Digital press. In addition, there may be some RGB images on the page which are assumed to use sRGB.

With this configuration, any objects painted in /DeviceCMYK are converted by a standard ICC transform of a source and destination profile. In this case the source profile is SWOP.icc, and the destination profile is Digital.icc . Similarly, objects painted in /DeviceRGB are converted by an ICC transform of the sRGB.icc and Digital.icc profile pair.

Objects painted in /DeviceGray are handled in a special way. There is no /DeviceGray source profile, so gray objects are also converted through the CMYK transform of SWOP.icc and Digital.icc. This is explained in more detail in DeviceGray interception.

The original color purity is not maintained in an ICC transform. So, a pure black is usually converted to a four-color rich black.

Figure: Re-purposing for digital press