Epson Pro L30002UNL 30,000-Lumen HDR Pixel-Shift DCI 4K Laser 3LCD Large Venue Projector (White) - Manual (Page 169)

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You see a screen like this:
5. Use the arrow buttons to adjust the value of the Gamma setting as follows:
• To brighten darker areas of the image, select higher gamma values. (Color saturation in the lighter
areas may become weaker.)
• To reduce overall image brightness and sharpen the image, select lower gamma values.
• If you are projecting using DICOM SIM as the Color Mode setting, adjust the gamma according to
the projection width. If it is less than 300 inches (7.62 m) wide, select a smaller value; if it is wider,
select a larger value.
6. To adjust specific tones in the gamma using a graph, select the Custom setting and press Enter .
You see a screen like this: