I'm rendering with Cycles in the viewport (not with F12) and would like to get that viewport output as an input node into the Compositor.
How can this be done?
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Well there is a way but it really is a cart before the horse thing. If you really need the image you can only get it by a screenshot, which will be limited to an 8 bit depth and the size of your viewport, obviously.
When it is saved you can then use a file node to import it into the node editor. As I said this is a nuts way to do it but it can be done.
Don't do it though use F12.