Digital Light & Color

It has been discussed some time ago, but I can't find the thread. It looks complicated, and it's probably not easy to do, but I thought it could be useful - I was hoping for something like this several times.

I was thinking of a way/tool that could display a preview a sample of the output image of some transformation downstream, while adjustments are being made to some other transformation upstream of it. Would that be potentially feasible at all?

There are several technical challenges, but the result would potentially be slow since the current and all the intervening transformations would need to be full recalculated to generate the preview each time you made a change, unless there was some other button to trigger the partial recalc. It is still on my list as something to explore someday.