added stepwise image downsampling to improve the resulting image quality #22
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html5 canvas is not very good at downsampling jpegs, the output quality is very poor.
this improvement does a stepwise downsampling which greatly improves the image quality.
the method is discussed here: http://stackoverflow.com/questions/17861447/html5-canvas-drawimage-how-to-apply-antialiasing
self-explanatory example, downsized from 1920x1200:
