Optoma Optoma TXR774 - Manual (Page 31)

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Display
Format
Use this function to choose your desired aspect ratio.

4:3: This format is for 4x3 input sources not enhanced for Wide screen TV.

16:9 I (XGA series)/16:9 (WXGA series): This format is for 16x9 input
sources, like HDTV and DVD enhanced for Wide screen TV.

16:9 II (XGA series)/16:10 (WXGA series): The non-standard wide-
screen display format of the projector. Part of the original image will
be cut if the image aspect ratio is less than 1.67:1.

Native: Depends on the resolution of the display.

Auto: Automatically selects the appropriate format.
User Controls