Because you can't pull an image off of someone's computer and upload it to your server with a proxy. Without cross domain limitations on canvas, you could do t

Because you can't pull an image off of someone's computer and upload it to your server with a proxy. Without cross domain limitations on canvas, you could do that. I wrote a bit about those rules a while back: http://simonsarris.com/blog/480-understanding-the-html5-canvas-image-security-rules http://simonsarris.com/blog/480-understanding-the-html5-canv...