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Get image data in Javascript
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//from: http://stackoverflow.com/questions/934012/get-image-data-in-javascript | |
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,/, ""); | |
} |
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