Adjusting the image quality, Hue, saturation, and brightness adjustment, Gamma adjustment – Epson Z8250NL User Manual
Page 171: Select and adjust the correction value, P.171

Adjusting the Image Quality
171
Adjusting the Image Quality
Hue, Saturation, and Brightness Adjustment
The Hue, Saturation, and Brightness for each of the R (red), G (green), B
(blue), C (cyan), M (magenta) and Y (yellow) color components can be
adjusted.
The menu is displayed in the following order.
Image menu - Advanced - RGBCMY
q
If you press the [Default] button while adjusting, the value that you are
adjusting is reset to the default.
Gamma Adjustment
Before are three ways the gamma setting in the configuration menu can
be adjusted.
Select and adjust the correction value
When a smaller value is selected, the dark areas of images become
brighter, but the lighter areas may become oversaturated. When a larger
value is selected, you can reduce the overall brightness of the image to
make the image sharper.
Hue
Adjusts the overall hue of the image, bluish – greenish –
reddish.
Saturation
Adjusts the overall vividness of the image.
Brightness
Adjusts the overall color brightness of the image.
Method
Menu
Select and adjust
the correction
value
Image - Advanced - Gamma
Adjust while
viewing the
image
Image - Advanced - Gamma - Customized - Adjust it
from the image
Adjust using the
gamma
adjustment
graph
Image - Advanced - Gamma - Customized - Adjust it
from the graph