I have a site running at pixie.strd6.com and images hosted through Amazon S3 with a CNAME for images.pixie.strd6.com.
I would like to be able to draw these images to
Just bumped into the same problem. I found out about CORS that might be helpful.
http://html5-demos.appspot.com/static/html5-whats-new/template/index.html#14
It didn't work for me since I'm trying to manipulate an image from Flickr. So, I'm still looking for the solution.