Represents the "DotGain" entry of the devicen mixing hints dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains an Element.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 73, page 164.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 72, page 206.

The DotGain dictionary maps colorant names to transfer functions that describe how the printed dot area grows relative to the requested tint. Dot gain is a physical property of ink spreading on the substrate.

Dot gain functions are used to compensate for tonal distortion in halftone output. Proofing software may apply them to produce a simulation that accounts for the expected gain on the target substrate.