How to receive php image data over copy-n-paste javascript with XMLHttpRequest

Question

I try to make an image-upload functionality similar to the one GMail uses. You copy (CTRL-C) an image from your desktop and paste (CTRL-V) it onto the website. The image is

Answer 1

Is it possible that the image file size is greater than your 'upload_max_filesize' setting?(usually defaults to 2 meg)