Luminosity Masks in Photoshop help tweak light and dark areas in an image very subtly and gives get liberty in controlling lights and shadows, which you cannot do directly with Levels and Curves. Luminosity Masks allow you to control the lights and shadows without affecting other portions of the image. I will explain the process step by step so that you can follow easily.
I have opened this free stock image in Photoshop.
The same image with tweaks with Luminosity Masks.
The tutorial is here
Other photoshop tutorials are here
