Epson EF11 User Manual page 57

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.
6. To adjust specific tones in the gamma using a graph, select the Custom setting and press Enter.
You see a screen like this:
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