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Color Shifting

This is the variation of the light reflected across the spectrum based on a surface that unevenly disperses light. For instance, pure white can be viewed as a yellow tint when projected.

Keystone

Keystone is when the projected image appears bigger at its top than at the bottom. Many projectors feature a keystone adjustment which gets rid of this distortion.

Ambient light

This is any light in a room from a source other than your home cinema projector. It may include daylight, hallway lighting or overhead lighting.

Contrast ratio

This is the ratio between the brightness of the brightest and darkest color. It’s basically the difference between the darkest black and brightest white. 

Viewing Angle

This is the maximum angle at which you can view the projected image with acceptable visuals.  Outside of this viewing angle it experience some change in brightness and some color shifting. The optimal viewing angles are between 30 and 40 degrees.

Resolution

The greater the number of pixels the cleaner and crisper the images will be. A high-resolution projector is perfect for displaying HD video, and detailed texts and graphs. Resolution is indicated as a combination of numbers like 1920 X 1200. This means that the projector has 1920 pixels horizontally and 1200 pixels vertically. A total of 2,304,000 pixels make up the image on the screen.

Projector lumens

This is a unit of measuring light. 1 lumen is equivalent to light from a foot of candle illuminating a 12-inch x 12-inch area.  The best LED projector can have anything between 2,000 lumens and 3,000 lumens. The number of lumens you choose will depend on the ambient light and image size.

Throw Distance

Throw distance is the distance between the screen image and the projector. It is simply the distance over which a projector can throw an image. The common projector throw distances include:
Long throw: these high-resolution projectors cast large images. These projectors are often hung on the ceilings of large rooms.
Short throw: projectors with this specification cast large images with reduced eye glare and shadows. These are often installed on walls or hang on ceilings close to the wall on which the image will be cast. Short throw projectors typically refer to a distance of between 3 and 8 feet from the projector.
Ultra-short Throw – projectors with these do not have eye glare or shadows. This type of throw specification is common in projectors installed on walls or on tables projecting downwards. Ultra