Epson PowerLite S4 User Manual page 15

Adjusting the Image Quality
Each time you press the button, the color modes change in the following
order.
The current setting appears in the top-right corner of the screen each time the
color mode is changed. While the color mode name is displayed on the
screen, it does not change to the next color mode setting unless you press the
button.
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The color mode can also be set using the "Color Mode" command in the
"Image" menu. See page 32.
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