Before and After in Camera Raw in Photoshop is very easy and helpful. Open the picture in Photoshop. Duplicate the background layer (Ctrl or Cmd J) Go to Filter > Camera Raw Filter and edit the picture
But how can you see the total effect of the edit in Camera Raw. Just click on the Y underneath the image.
Now you see the before and after:
By clicking on the Y you can see more 'Types of Before and After'