Q:

Am I correct in understanding that vector printing in SilverLight 5 will only work with a Postscript printer?

I had read some blogs about SilverLight 5 and find it hard to believe what I read! 

That even on Windows,  SilverLight 5 will only do vector (high
  quality) printing to a postscript printer.

(Also happened to XML Paper becoming  the format that all print drivers understood on windows…)

A:

I found Silverlight 5: Vector and Bitmap Printing for Reports and more to be quite helpful regarding PostScript printing in Silverlight 5.
In particular:

If your content or your printer doesn't support PostScript printing,
  Silverlight automatically falls back to sending an uncompressed bitmap
  to the printer. If your printer doesn't support PostScript, you'll see
  the effect of opacity in the printed results (some items lighter
  colored than others, for example) as the fallback bitmap mode supports
  opacity.

I take it that Silverlight 5 will still print to PCL printers but there may be a degradation in quality.

