download jpeg
// http://stackoverflow.com/questions/3916191/download-data-url-file
// http://stackoverflow.com/questions/10473932/browser-html-force-download-of-image-from-src-dataimage-jpegbase64
// http://stackoverflow.com/questions/17397319/save-canvas-as-jpg-to-desktop
function getBase64Image(img) {
// Create an empty canvas element
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
// Copy the image contents to the canvas
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
// Get the data-URL formatted image
// Firefox supports PNG and JPEG. You could check img.src to
// guess the original format, but be aware the using "image/jpg"
// will re-encode the image.
var dataURL = canvas.toDataURL("image/png");
return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
}
function downloadURI(uri, name) {
var link = document.createElement("a");
link.download = name;
link.href = uri;
link.click();
}
a = document.getElementById('ctl00_bodycontent_photoproxy')
b = getBase64Image(a)
downloadURI("data:image/jpeg;base64,"+b, 'vegas-test.jpeg');