G - Commands   
GUI_ZOOMORIG (command)
   Overview   Operations  Commands 

It adjusts the Zoom to the resolution of the original background Raster image, if existing

   Main toolbar: 

  Menu : Window Zoom     Zoom to raster resolution

 Command line:  GUI_ZOOMORIG

It adjusts the zoom to the resolution of the original background Raster image, if existing in the current drawing.