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Adjusting Color Balance by Selecting a Neutral Gray Point
To adjust overall color balance by identifying a neutral gray point in the pic- ture, click the gray eyedropper button. Then click on an area of the picture that should be neutral gray, such as a metallic object, concrete, gray brick, or a shadow falling on a white object.
The area you clicked becomes neutral gray, and all other colors in the image are adjusted accordingly.
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