Xournal has the possibility to take a screenshot of a window, you could use that to compare the contrast performance on the DR.
Open a (pdf-) document in UDS (standard viewer). Start Xournal and use the menu: Journal->Background Screenshot. Xournal will go to the background and from the first window that you touch with your stylus a screenshot will be made. Use the TaskBar to go back to Xournal and save the document as pdf.
After installing R2.0 do the same (with the xournal version for R2.0).
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