Something I found on the web...Astrophotography Lab. Can be used to measure, automatically:
gain,
read noise,
saturation capacity etc.
Of your... DSLR camera sensor. It also lets you find values like signal-to-noise ratio, dynamic range and dark noise by selecting parts of your images.
Well I thought it interesting.
edit:
Jeez ya reckon I'd include a link....
http://oaltais.github.io/aplab/
http://www.astronomyforum.net/astrop...raphy-lab.html