Creates a Separation colour space whose full tint looks like alternateColor, or returns the one this document already has for the same values.
public PdfSeparationColorSpace CreateSeparationColorSpace(string colorant, PdfColor alternateColor)
The colourant's name, such as a spot ink's; All or None for the special colourants.
The colour a tint of 1.0 is shown as where the colourant is not available, in a device space, CalGray, CalRGB or a gray, RGB or CMYK ICCBased space; a tint of 0.0 is no ink (white).
[/Separation /colorant alternate tintTransform], an indirect array.ISO 32000-2 §8.6.6.4 (PDF 1.2). The tint transform is written as an exponential function (§7.10.3, Type 2, PDF 1.3) from the
alternate's white (all 0 for CMYK, all 1 for additive spaces) at tint 0 to alternateColor at tint 1, with
exponent 1. Records PDF 1.3. A mutation.