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Thankyou :) I'll give it a go, I hadn't seen that the code was with the extension.

Hi, Thank you so much for answering, sorry I wasn't clear that I was using Gamemaker... I see that I can go up to the buffer_get_address in gamemaker, but can't see ImageData or putimagedata... so I'd have to make an extension from there in JS for it to work? :) 

Hi, is there a way that we can save a specific surface with this rather than just the screen in html5 please? :) Thank you