I have used quite a lot of Adjustment Brush in ACR, for selectively underexposing some subjects. Now I want to open the file in Adobe Photoshop to continue some more retouching, but I need the area that I used the adjustment brush over to be selected. Is it posibile and how would one do it ? Thank you very much,
Those are two entirely different things. The only thing I can think of is stacking adjusted/unadjusted in "Difference" blend mode and reconstructinga selection/mask based on that. You won't get the area directly, but you can work on it a bit and get a good approximation.