This would be awesome. At the same time, one could use something like ImageMagick to find out the dimensions of the picture and set this ratio programatically

This would be awesome. At the same time, one could use something like ImageMagick to find out the dimensions of the picture and set this ratio programatically (http://stackoverflow.com/questions/16266933/rmagick-how-do-i-find-out-the-pixel-dimension-of-an-image http://stackoverflow.com/questions/16266933/rmagick-how-do-i...)