An effect which causes distortion of a projected image because the projector is not at a 90-degree angle to the screen.The distance to the top of the image on the screen is much greater than to the bottom.

A video distortion effect that occurs when the projector is not set up directly in front of the screen.

Keystone is the distortion that can occur when a projected image source and screen are not correctly aligned. This results in an image that might be narrow at the bottom and wider at the top. All Sony projectors have digital keystone correction which enables this to be digitally corrected.

A form of video image distortion in which the top of the picture is wider than the bottom, or the left is taller than the right, or vice versa. The image is shaped like a trapezoid rather than a rectangle.

Keystone: The distortion produced when projecting images at an angle to a screen. Images will be wider or narrower (top to bottom or left to right) as the video projector angle increases.

Correction for vertical or horizontal offset between a projector and the screen.

The distortion of an uncorrected image projected on a wall or screen, typically shown to be wider across the top and shorter across the bottom, resembling a keystone in a doorway.

The distortion of a projected image caused by improper projector-to-screen angle.

Trapezoid distortion usually caused by the projector being located lower than the screen center line or bottom. Most current data projectors have the capability to control this effect.