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If I export an OmniGraffle drawing as a PDF and then view it in Preview, the colours are exactly as created. However, if I view the same file in Adobe Reader, the colours are darker and more muted. The same file can be viewed by the two programs side by side on the same Mac to prove the difference. This is true whether the file is read using Adobe Reader on Windows or Mac and is a problem since the PDF files will largely be viewed by Windows users.

I've tried creating a PDF file on the same Mac using other applications such as Microsoft Word and the colours are the same in Word, Preview or Acrobat Reader, which leads me to believe that it's the export from OmniGraffle that is the problem.

How do I get consistent colour between Preview and Adobe Reader in exported OmniGraffle drawings?