Adjust the gamma setting by dragging the triangle icon on the Gamma color wheel in the Look panel. Drag clockwise to lower the gamma setting or counter-clockwise to increase it.
To move the triangle icon on the color wheel, drag it left or right in a straight line. Don't drag in a circle. The further left or right you drag, the larger the change.
Use the RGB waveform to guide your adjustments. To display the Waveform panel in the Monitor view, press the W key. For more information, see Waveform panel.
If the image appears milky, flat or lacks punch, increase the gamma setting by dragging the triangle icon counter-clockwise.
If the image has punch but lacks shadow detail, lower the gamma setting by dragging the triangle icon clockwise.