I have a dozen photos of a subject in a studio and the background shade must be changed on all to a medium gray. I know I can do this in LR by using the Adjustment brush tool and use Auto Mask to protect the subject while changing the background color. But. The subject is a person with long hair and this is tedious. Does anyone know if there's an easier way in LR to do this, and if so, is it in the LQ book? Also, I thought I remembered using PS for this long ago and that it was almost a one-click exercise. Does anyone know if this is true, and if so, is there a link to a tutorial or instruction that you could show me? Thank you so much in advance for any guidance.