To Gamma Correct the Image
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From the Image menu, choose Gamma Correction.
The Gamma Correction dialog opens.
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Do one of the following:
Adjust the slider towards the right for a lighter image or towards the left for a darker image. The Gamma Correction field updates to show the current numeric value.
or
Enter the value in the Gamma Correction field. An acceptable value is in the range 0-2, with 1.00 representing no correction. Decreasing the value results in a darkening of the image while increasing the value results in a lighter image.
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Do one of the following:
Click the Apply button to process the image with the value entered.
or
Click the Preview button to see the change without modifying the image in memory.