(v13) Color management definitions

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

Blend space: The device space used in a transparency group for compositing operations. It may be tagged or untagged.

CMYK: Cyan, Magenta, Yellow and Black. The ink colors used when process printing. Jobs for four color process printing are separated into CMYK.

BPC: Black Point Compensation.

CMM: Color Management Module.

CMS: Color Management System.

Device space: A color model describing the color of the device. Conventional examples are CMYK, RGB, and Gray.

Input profile: Throughout this document this is typically an input profile as defined by the ICC specification, but could also mean either an ICC display or color space conversion profile, that is, a profile that converts color values to the ICC PCS.

Output profile: An output profile is typically an output profile as defined by the ICC specification, but could also be an ICC display profile, but not a color space conversion profile.

Skin: The OEM code written around the Harlequin RIP core.

Tagged device space: A device space associated with a color space definition, for example, CMYK associated with a CMYK ICC input profile.

Transparency mode: When the RIP is processing a transparent job or recombining a pre-separated job.

Transparency group: The term group is PDF terminology; the equivalent concept is sometimes called a layer in other applications. It is a subset of a page in which compositing is applied consistently. The result of compositing is a raster expressed in the groups Blend space. Transparency groups may be nested.

Untagged device space: A device space without a defined color space, for example, CMYK without an associated ICC profile.

Virtual device: An artificial device within the RIP for the purpose of compositing transparency jobs. There will be a color conversion from this virtual device to the output device. When the RIP is in non-transparency mode, the virtual device will not exist, and color management will be directly from the colors in the job to the output device.