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Convert RGB PDF to CMYK
https://forum.pdfsharp.net/viewtopic.php?f=2&t=4078		 Page 1 of 1
Author:  kernig [ Fri Jan 03, 2020 3:37 pm ]
Post subject:  Convert RGB PDF to CMYK
Hello,

I would like to know if there is a possibility to convert a PDF that is RGB into one with CMYK using PDFSharp in C#.
I'm already using PDFSharp for setting trim margins and the above mentioned functionality would save alot of time.

I've already tried something like this, but the new PDF is still in RGB

Code:
PdfDocument pdftest = PdfReader.Open(filename, PdfDocumentOpenMode.Import);
pdftest.Options.ColorMode = PdfColorMode.Cmyk;
PdfDocument oPDFNew = new PdfDocument();
PdfPage page1 = pdftest.Pages[0];
oPDFNew.AddPage(page1);
oPDFNew.Options.ColorMode = PdfColorMode.Cmyk;
oPDFNew.Save(filename2);


Thanks for your help
Author:  TH-Soft [ Sat Jan 04, 2020 1:13 pm ]
Post subject:  Re: Convert RGB PDF to CMYK
Hi!
kernig wrote:
pdftest.Options.ColorMode = PdfColorMode.Cmyk;
This applies to new content you add to pages using XGraphics objects.

PDFsharp does not convert existing pages to the other format.
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