Photoshop Cc & its Blend If adjustment
Photoshop CC & Blend If I and assume many others now use Blend If on virtually every image process. Presently this powerful tool still looks like an afterthought on behalf of Adobe. My suggestion, would be that this tool becomes a stand alone supercharged tool and be reconfigured to make more accurate adjustments - this can be linked to a curves adjustment layer to help determine reasonably accurately the luminosity range that is being adjusted. I would find this an enormous help in fine tuning adjustments.