I'm a big fan of the dark canvas theme and was looking for a way to print sheets of this theme to PDF. The purpose was to be able to share dark theme views with clients or people without access to Revit. You cannot use the usual print-to-pdf function as it reverts your views to the light theme. The community forum suggested the solution of exporting the dark theme view as an image. Using the default settings, the image was blurry, but after some adjustments, it provided a clear, sharp image in the dark theme. Below are the export as image settings used:

I hope this helps others and thanks to those who made suggestions!
Kevin