Epson 61p - Manual (Page 55)

Fine-tuning the Projector 55
Adjusting the Input Signal
Although the projector normally detects and optimizes the input
signal automatically, you can use the Signal menu to make manual
adjustments. In addition to changing the position of the projected
image, you can correct tracking and sync for computer images, or
change the aspect ratio to widescreen format for video images.
1. Press the Menu button. You see the Image menu.
2. Select the Signal menu. You one of the following screens:
Computer (analog RGB) and RGB video
Component video
Composite video and S-video