title: Converting groups/layers in fabricjs to image
body: <p>Im currently looking into fabric.js as well as konva.js and fabric.js seems to have the advantage not to have to implement all selection tools manually; However while in konva.js it is quite obvious how to extract an image "projection" of a layer (as each layer there has at least one canvas on its own), I dont know if difficult it is to convert a group in fabric.js into an image (not svg!). Basically I need some output object which I can convert into a bitmap of certain size for further processing steps.</p>
  
  <p>Thank you for any help :)!</p>