Extracting images from a PDF

I had a 140 page PDF and wanted each page as an image. Each page happened to be a scanned image, so it was as simple as extracting all images from the PDF.

Install PDF utilities
sudo apt-get install poppler-utils
Save images as jpg using pdfimages
pdfimages -j file.pdf imagename
You can also save as ppm images, which are larger than jpg but are lossless
pdfimages file.pdf imagename