I recently took what I think is a fairly nice shot of my horses head using my iPhone. The lighting wasn’t brilliant so using Lightroom on my laptop I’ve made some adjustments. The only thing I haven’t been able to do is edit the background which is rather cluttered. I found a really good tutorial by an equine photographer on You Tube which shows how to make the background black using Lightroom but when I try to follow this and adjust the contrast etc it changes it for the whole photo. Any ideas what I’m doing wrong?