Is it possible to invert a mask created with the ACR adjustment brush?
I want to make an adjustment to everything except what I paint with the adjustment brush (with auto mask turned on). I know how to invert a selection in Photoshop, but don't know if it is possible in ACR. I'm using ACR version 8.2. on W7
Nope...you can duplicate and adjustment but not invert it.
Jeff, Thank you for the clarification. Hopefully Adobe will add the functionality some day. Theoretically, I'd prefer to do most of my lighting adjustments in ACR for a number of reasons, but the ACR tools seem generally less polished than Photoshop. The ACR Adjustment Brush in auto mode seems easier to use than the Photoshop selection tools like the Quick Selection Tool, but not being able to invert is a significant handicap.