title: How to convert an image object to a binary blob
body: <p>Is it possible to parse an image object (<code>&lt;img&gt;</code>) in the DOM as if it had been uploaded and opened with FileReader? I am trying to use <a href="http://benno.id.au/blog/2009/12/30/html5-fileapi-jpegmeta">jpegmeta.js</a> to extract EXIF metadata from JPEGs, but it needs binary strings which are returned by the FileReader.</p>
  
  <p>It might be possible to use XHR to load the image from its URL and parse it with FileReader. However, this would incur a lot of overhead if every image has to be downloaded twice. Another option could have been to use the canvas, but that loses the exif data when converting.</p>