How to choose the best portable video projector: keystone correction

Comment choisir le meilleur vidéo projecteur portable : la correction trapézoïdale

Understanding the keystone correction of a video projector:

A guide to choosing the right portable projector

When you're looking to purchase a portable video projector , you're probably overwhelmed by a multitude of technical features. One such term is “keystone correction,” also known as “keystone.” So, what is keystone correction and what role does it play in choosing your portable projector?

What is keystone correction?

Keystone correction refers to the ability of a projector to correct a distorted image. When the projector is not perfectly aligned with the screen, the projected image may be shaped like a trapezoid rather than a rectangle. This phenomenon often occurs when the projector is placed too high, too low, or to the sides of the screen. Keystone correction then adjusts the image so that it appears as a perfect rectangle.

There are two types of keystone corrections: vertical and horizontal. Vertical keystone correction is usually standard on most portable projectors, as they are often placed below or above screen level. Horizontal keystone correction, on the other hand, is rarer and is useful when the projector is offset to the sides.

Importance of Keystone Correction in Choosing a Portable Projector

Flexibility is one of the key benefits of portable projectors. Their ability to be used in a variety of settings, whether for an on-the-go presentation or an outdoor home theater, makes them a popular choice. However, this mobility also means that you cannot always guarantee ideal positioning of the projector in relation to the screen. This is where keystone correction comes into play.

A portable projector with good keystone correction allows you to get a perfectly rectangular image no matter where you place it. This means you can install your projector wherever you want without compromising image quality. If you plan to use your projector in situations where ideal positioning is not always possible, effective keystone correction is essential.

To go further, some high-end projectors offer automatic keystone correction. These projectors detect their own angle and adjust the image accordingly, making installation even easier.


In short, keystone correction is a key feature to consider when purchasing a portable projector. It ensures a sharp, well-proportioned image no matter where you install your projector. Don't underestimate the importance of this feature, especially if you plan to use your projector in various situations where perfect alignment is not always possible.

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