When inside Camera Raw making changes with the adjustment brush, you may find that you need to erase part of the change you’ve made. You can of course click on the “Erase” radio button in the “Adjustment Brush” panel and then erase the changes. An easier way is to simply hold down the option/alt key, then your brush temporarily (whilst you are holding down the key) turns into erase.
Tags: camera raw, photoshop