Optoma Optoma EP550 - Manual (Page 14)

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English
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Presentation Functions -- video source
To adjust the contrast or brightness of the image, select
“Contrast/Brightness” from OSD menus.
To adjust the color or tint of the image, select “Color/
Tint” from OSD menus.
Press the “Freeze” button to still the screen image.
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Contrast/Brightness
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Color/Tint
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Freeze