Imported PDF file looks washed out
 

I imported a PDF file of a floor plan to use as background. OG is placing furniture in designated places. The PDF version of the floor plan by itself prints beautifully on an HP LaserJet 4200 (high res black and white), but printing the same item imported into OG yields a more faint, almost washed out appearance. It is difficult to read. What can I do to improve the OG print? By contrast, the same PDF when imported into InDesign comes out looking just fine. I'm not an Adobe shill. I use that comparison to show that the PDF itself is in good shape. I would like to get the same result with OG since OG, in its specialty areas, offers many creation and layout advantages over the Adobe apps.