: ACR 4.6 is the absolute latest version compatible with Photoshop CS3 . Users of Photoshop CS4 or later must use ACR 5.0+.
Once installed, you can use Camera Raw to enhance images beyond just "Raw" files. Editing JPEGs & TIFFs : You can force JPEGs to open in Camera Raw by going to Edit > Preferences > Camera Raw in Photoshop and changing the File Handling The "Filter" Method : If you are already inside Photoshop, go to Filter > Camera Raw Filter to apply raw-style edits to any layer.
Program Files > Common Files > Adobe > Plug-Ins > CS3 > File Formats Replace the existing file with version 4.6. Key Features of Version 4.6 Clarity Slider