A proprietary format owned by Adobe until 2008, when it was released and relicensed as an ISO standard.
Free software tools that work with PDF
Thanks to the Ghostscript project, there are many free software tools that work with postscript.
apt-get install poppler-utils
pdftocairo -png mydoc.pdf
Creates a series of PNG files.
Python tools to manipulate / generate PDF
An example using reportlab (see http://stackoverflow.com/questions/2252726/how-to-create-pdf-files-in-python)
from reportlab.pdfgen import canvas from reportlab.lib.units import inch, cm c = canvas.Canvas('ex.pdf') c.drawImage('ar.jpg', 0, 0, 10*cm, 10*cm) c.showPage() c.save()