Smoothing lines in canvas:
  * http://codetheory.in/html5-canvas-drawing-lines-with-smooth-edges/
  * http://stackoverflow.com/questions/15601131/html5-canvas-line-how-can-i-let-them-appear-smoother

SVG has [[http://stackoverflow.com/questions/4179069/drawing-good-looking-like-in-flash-lines-on-canvas-html5-possible|better antialiasing?]] This appears not to be true with you take advantage of the retina display in canvas?


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for SVG check out the [[http://raphaeljs.com/|Rachael]]library.

  * [[http://mirohibler.github.io/RaphBoard/|SVG drawing example]]

put image on canvas: drawImage