Using the Auto Levels command

The Auto Levels command defines the lightest and darkest pixels in an image, and then redistributes intermediate pixel values proportionately. Because Auto Levels adjusts each color channel (red, green, and blue) individually, it may remove or introduce color casts.

Auto Levels gives good results when an image with an average distribution of pixel values needs a simple contrast adjustment.

To use the Auto Levels command:

Do one of the following:

To change the amount of white and black values clipped:

1 Hold down Alt (Windows) or Option (Mac OS), and click Options in the Levels dialog box.

2 In the Auto Range dialog box, enter the percentage of extreme highlight and shadow pixels to ignore, and click OK. A value between 0.5% and 1% is recommended.

Making Color and Tonal Corrections > Adjusting tonal range > Using the Auto Levels command