C＃文档中的PDFsharp具有CMYK和RGB两种颜色模式

Question

In a C# project with PDFsharp (WPF build) I save a PDF document setting

PdfDocument document = new PdfDocument();
document.Options.ColorMode = PdfColorMode.Cmyk;

In the document I draw an image stored in another PDF source and a PNG/TIFF image (depends).

When I open the saved document in Adobe Bridge it tells me that both color modes CMYK and RGB are set in the document. How can I make PDFsharp save my document in CMYK only?

Answer 1

Make sure that all PDF sources used to create the new PDF are set to CMYK. The setting you use applies to new PDF content, but not to pages imported from external source PDFs.