I wanted to automate image comparison through dalekjs. Aim is to have better image comparisons through external libraries but for starters a basic image comparison will do to tell if image on page is equal to local image. Help is highly appreciated.
Still experimental and is yet to be merged into DalekJS core, but you could try using gskachkov's pull request here which adds screenshot comparison functionality to DalekJS.
Otherwise, I would recommend you to use PhantomCSS as your visual regression framework for the time being. PhantomCSS is built on top of CasperJS and uses Resemble.js for image comparison.