ACR filter: short for Adobe Camera Raw, and a filter plug-in that comes with PS. ACR is a post-processing tool for RAW format photos, which supports all raw formats and automatically associates them, such as the common .nef.cr2.arw.dng and so on.
1. ACR interface understanding and function setting
1. There are two ways to open Camera Raw
One is to open a photo in PS, and then click Filter →Camera Raw Filter in PS menu to open the Camera Raw interface.