Thanks for the reply. Does your suggestion respond to screen size as well as pixel ratio? This site: http://sanscolour.com/ http://sanscolour.com/ calls a dif

Thanks for the reply. Does your suggestion respond to screen size as well as pixel ratio? This site: http://sanscolour.com/ http://sanscolour.com/ calls a different image depending on the browser size. Mobile it calls small.jpg, for laptops it calls medium.jpg and for monitors it calls large.jpg. I'm pretty sure they're using Foresight.js to call the appropriate image.