Epson PowerLite U50 3700-Lumen WUXGA 3LCD Projector - Manual (Page 97)

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Correcting Image Shape with H/V Keystone
You can use the projector's H/V Keystone setting to correct the shape of an image that is unevenly
rectangular on the sides.
Note: You cannot combine H/V Keystone correction with other image shape correction methods.
1. Turn on the projector and display an image.
Note: You can display a pattern to aid in adjusting the projected image using the Settings menu.
2. Press the Menu button.
3. Select the Settings menu and press Enter .