A transfer function as a graphics state holds it: the identity, one function for every colour component, or one function for each of the four components of a CMYK-like device.
public sealed class PdfTransferFunction
ISO 32000-2 §10.5 and Table 57 (TR, TR2; deprecated in PDF 2.0). Each function takes one input and gives one
output, both in 0 to 1. The device default (TR2 /Default) is a graphics state without a transfer function.
kind:method, kind:property, kind:ctor. Press Esc to clear.FunctionsGets the functions: none for the identity, one applied to every component, or four (cyan or red, magenta or green, yellow or blue, black or gray).IsIdentityGets a value indicating whether this is the identity (/Identity).ValueGets the entry's value as written: the name Identity, a function, or an array of four functions.