OK, I actually did this using CSS instead, and it works perfectly well. But it still seems like the sort of thing that ought to be more directly supported, maybe?
Something like fullwidth makes sense to me. One design question would be whether the image should be scaled up if it's narrower than the div's width - what do you think?
right now "full" and "original" mean the same thing in terms of size. Perhaps we should change the meaning of full? We could do this quickly by loading the original image.
I generally don't like scaling up images, so we'd probably use max-width.
fwiw, I don't really like the idea of a separate view for this. You might want this size option in titled, content, open, etc.
ticketed: support on-demand image sizing