# ghostscript extracts images from a PDF as BMP with 600dpi gs -dNOPAUSE -sDEVICE=bmp16m -sOutputFile=%d.bmp -r600 -q "input.pdf" -c quit
# ghostscript extracts images from a PDF as BMP with 600dpi gs -dNOPAUSE -sDEVICE=bmp16m -sOutputFile=%d.bmp -r600 -q "input.pdf" -c quit