title: PixelCompare with right calibration
body: <p>Use Case: There are several as-built plans as PDF files. The PDF files represent different planning states.</p>
  <p>Plan A - as-built plan first floor from 1950 on paper size Letter
  Plan B - as-built first floor plan from 1999 on paper size DIN A2
  Both plans are scaled to maximum paper width.</p>
  <p>Is there a possibility to calibrate the PDF files within the Autodesk Forge Viewer to overlay the files in the correct scaling?</p>