The histogram in the Camera Raw dialog box shows the tonal range of the image at the current settings. As you make settings adjustments, the histogram automatically updates.
To undo your manual adjustments and make the adjustments automatically, select Auto. To restore all options to their initial settings, press Alt and click Reset.
To open a copy of the camera raw image file (with the camera raw settings applied) in Photoshop Elements, click Open. You can edit the image and save it in a Photoshop Elements-supported format. The original camera raw file remains unaltered.
To save the adjustments to a DNG file, click Save Image. (See Save changes to camera raw images.)
To cancel the adjustments and close the dialog box, click Cancel.