Epson EH-TW4000 - Manual (Page 24)

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Advanced Color Adjustments
RGB adjustment (Offset, Gain)
RGB adjustment (Offset, Gain)
Press and then select
"Image" - "Advanced" - "RGB" in that
order and confirm the selection.
Use or (UP or DOWN) to
select an item, and then use or
(LEFT or RIGHT) to make the
adjustment.
To return the adjustment results to their
default settings, press .
Press to exit the menu.
The image brightness can be adjusted by adjusting
the individual R (red), G (green) and B (blue)
components of the dark areas (offset) and bright
areas (gain).
Adjustment is not possible when "Color Mode" is
set to "x.v. Color".
If you would like dark areas to appear more clearly,
change the setting to the + (right) side. If you
change it to the – (left) side, the whole image will
become sharper, but the contrast in dark areas will
become poorer.
If you would like bright areas to appear more
clearly, change the setting to the – (left) side. If
you change it to the + (right) side, you will feel
that the image is becoming brighter and closer to
white, but the contrast in light areas will become
poorer.
Offset
Gain