PDF2JPG is a simple, extremely fast utility that effectively splits out multipage pdfs into single pages JPGs. You can do this in Automator, but the process is complicated, and is missing several features that are needed in print production environments. Users can set the resolution (72, 150, 300, 600), Color or Greyscale, and overall JPEG Quality. In addition the user can choose to include subfolders as well to search.