How to convert RGB to CMYK?

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   I creates PDF files by means of the Cairo library from GTK+. No jpeg images, just text and simple figures (rectangles, lines, circles, etc.) inside PDF documents. The Cairo API supports RGB colors only.

Now I need to use CMYK colors to my PDF files. So, my question: is it possible to convert RGB colors to CMYK colors in existing PDF files (by using of Debenu Quick PDF Library)? Get every object in a PDF document one by one, get their RGB colors, convert to CMYK and save the result. If it's possible, how to do this?

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Boris26 Members Profile Find Members Posts Beginner Joined: 15 Apr 13 Location: Moscow Status: Offline Points: 7	Post Options Post Reply Quote Boris26 Report Post Thanks(0) Quote Reply Topic: How to convert RGB to CMYK? Posted: 27 Mar 19 at 10:33AM
	I creates PDF files by means of the Cairo library from GTK+. No jpeg images, just text and simple figures (rectangles, lines, circles, etc.) inside PDF documents. The Cairo API supports RGB colors only. Now I need to use CMYK colors to my PDF files. So, my question: is it possible to convert RGB colors to CMYK colors in existing PDF files (by using of Debenu Quick PDF Library)? Get every object in a PDF document one by one, get their RGB colors, convert to CMYK and save the result. If it's possible, how to do this?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 27 Mar 19 at 8:58PM
	Hi Boris, converting RGB-to CMYK-values (or the other way round) isn't possible with QuickPDF. Sorry...
	Cheers, Ingo