Two issues I am running into:

   1.  When using the ImageExporter class, there is no obvious method to 
   set the height and width of the image dynamically.
      1. I've tried exporter.params.param("width").setValue(1800), which 
      changes both the height and width.
   2. Has anyone been able to successfully print a scene to a .PDF file 
   after scaling the image?

Basically, I need to create a .PDF that is A4 paper size which includes a 
scaled, high-resolution capture of the current scene, regardless of the 
applications resolution.

Any help is greatly appreciated!
  

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