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Ink Splitting: Transfer-Curve vs. DeviceLink

Summary

This page collects a technical analysis of the two main methods for handling ink splitting (light/full ink separation, e.g. light cyan/cyan, light magenta/magenta, light black/black) in digital print color management:

  1. Transfer curve — parametric, per-channel 1D transfer curves, defined by break points (solid-ink start/end, light-ink max/end).

  2. DeviceLink — a dedicated DeviceLink profile ("ProfileType" = "InkSplitDeviceLink"), as implemented in ColorLogic's CrossXColor SDK, with either manual (curve-based) or automatic ("Auto") calibration from measurement data.

The attached document compares the two approaches across: underlying model, handling of channel-to-channel interaction, setup effort, computational cost, portability, support for 3-ink (light/light-light) splitting, and gamut optimization.

Key takeaway

Neither method is measurement-free: both require a measured test chart for a colorimetrically decent result. The real difference is the scope of the chart:

  • Transfer curve: single-channel gradients are enough (lighter chart).

  • DeviceLink "Auto": also requires all two-color overprint combinations (full InkSplitting chart), needed to capture real colorant interaction and to enable gamut optimization.

When to use which


⚙️ Scenario-to-Method Mapping

Scenario

Recommended method

1

Fast press-side tuning, simple ink set, minimal infrastructure

Transfer curve

2

Color-managed workflow already built on ICC/CrossXColor profiles, 3-ink splitting, need for colorimetric accuracy or gamut optimization

DeviceLink (InkSplitDeviceLink)

In practice, the CrossXColor SDK allows for a hybrid approach: InkSplitDeviceLink can be driven by explicit curves (InkSplitCurves), combining the simplicity of Method 1 with the portability of a DeviceLink profile that can be chained with the rest of the pipeline.

Attachment

The full white paper (technical details, pros/cons comparison table, and recommendations) is attached to this page: Light_Ink_Splitting_Whitepaper.

Light_Ink_Splitting_Whitepaper.md

Technical source: CrossXColor SDK Documentation v1.22.7 (ColorLogic / HYBRID Software), section 4.15 "Ink-Splitting".