Quick fix of backgrounds using curves (Patreon)

This is one technique I use very often if I need to change the tonal range of an area quickly, like here where the floor is too light compared with the background and model. 

I don't want to affect the dark background or the model, but I'm too lazy to build exact masks (especially when I don't have to).

It's so easy to fix using just curves and a layer mask in just a few seconds.

All it requires is there is a tonal difference between the edges of what you want to change and the area you want different.

Have fun.