Returns a DeviceCMYK colour.
public static PdfColor FromCmyk(float cyan, float magenta, float yellow, float black)
The cyan component, 0 to 1.
The magenta component, 0 to 1.
The yellow component, 0 to 1.
The black component, 0 to 1.
ISO 32000-2 §8.6.4.4.