C# iTextSharp: How to specify Spot Colors

Question

I am using iTextSharp to add text to PDF files.

The Text Color is usually specified as CMYK, but will require the need to specify spot/special colors.

There is an example here

In the Line:

PdfSpotColor spotColour = new PdfSpotColor("PANTONE 100 CV", 0.5f, new GrayColor(0.9f));

Does anyone know the description and meaning of the paramaters

so we have (string name, float tint, Color altcs)

I assume the name is the Color Separation Name. Not 100% sure what tint is or its range, is that some kind of alpha/transaparency value? and is the altcs a display color, rather than the separation layer used for actual printing?

Answer 1

I just pulled up somiTextSharp code I had and my method parameters are different for the PdfSpotColor. I only have 2 parameters, and there are no overloads. The example you gave is from the original java project. I think that is why they are different.

Here is what I have:

var color = new PdfSpotColor("spotColorName", new BaseColor(50, 50, 50));

... where the numbers are the red, green blue. The BaseColor constructor has overloads, so you can even give it a .NET Color if you want.

Unfortunately, I don't know much else about this class. Hope that helps!