Undoing LUT Adjustments
Because the enhancement features (Equalize, Contrast Enhancement, Display Range, and Invert Contrast) are implemented through a Lookup Table, the changes made to the appearance of your images are not permanent. You can restore the image to its original appearance at any time.
To do this:
Find the Display group on the Adjust tab’s ribbon.
Click the Reset Display tool.
The Lookup Table is reset and the image appears as it did before any enhancement options were defined.