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| I would prefer to do most of these steps in an image processing tool like photoshop, |
Definately and a lot of times this will be the case, still I love the idea that I can use the node based editor to create all sorts of operations and rig them to the specific controls that I want, instead of recording a bunch of photoshop actions.
Another use could be 3d rendering post effects, where you need to do the same kind of stuff to all your images. It's nice to have sliders for all your steps at once.