This class represents the type 2 function dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 40, page 96.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 40, page 126.

A Type 2 function defines an exponential interpolation between two values. It computes the output as C0 + x^N * (C1 - C0), where x is the input value and N is the interpolation exponent.

C0 and C1 are arrays giving the output values at input 0 and input 1 respectively. Their length equals the number of output components. When absent, C0 defaults to [0] and C1 defaults to [1].

The N entry is the interpolation exponent. For N equal to 1, the function is a linear interpolation. For N equal to 2 or greater, the interpolation follows a power curve that rises more slowly near 0 and more steeply near 1. Fractional values of N are permitted.

Type 2 functions are commonly used as tint transforms in Separation and DeviceN color spaces and as the color function in axial and radial shadings.

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