How To Avoid Having A Pixelated Image

The term "pixelated" simply means that you can see the individual pixels

, as opposed to viewing a smooth and seamless image. Imagine, for example, that you were viewing a slide show through a screen door, and you would have a good idea of what a pixelated image looks like.

In fact, pixelated images are also referred to as the "screen door effect" or as "fixed-pattern noise." The visual effect makes the whole screen look like there's a small rectangular or hexagonal grid of black lines running throughout the image.

What Causes It?

Pixelation can occur on an LCD or DLP projector, and is merely a matter of how the device projects each dot of information onto the screen. The tiny electronics that surround each pixel deep inside the projector are what block the light from shining perfectly evenly.

Back in the 1980s, the first digital projectors all displayed fixed-pattern noise (pixelated images), but we were somewhat immune to it, and forgiving of the new technology. Today, technology has made great advancements, making pixelation far less noticeable. Yet, on those occasions when we do see pixelated images, it can cause a great distraction. There are four ways to avoid or resolve pixelation.

Use DLP

DLP stands for Digital Light Processing, and DLP projectors are far less susceptible to pixelation as compared to LCD units. Naturally, some minor pixelation will occur, but it's less perceptible than with LCD projectors.

Go High-Res

Choose a higher-resolution projector to avoid or diminish pixelation. Resolution simply refers to how many pixels your projector unleashes onto the screen. Higher-resolution projectors (for example, a 3000-lumen projector) display more pixels at once. More pixels may mean more lines -- but it also means that those lines are much smaller, creating an overall clearer and less pixelated image.

Step Back, Jack

If you move your audience back, they will be less able to detect pixelation. The farther your audience is from the screen, the less they'll be able to see the individual pixels and the lines between them. After all, every digital image looks pixelated at a very close distance.

Time to Re-Focus

A sure-fire way to reduce the screen door artifact is by playing with the focus a bit. This will cause the lenses inside the projector to optically blend pixels together. Start with the projector perfectly focused - so that the screen effect is crisp and visible - then move the focus ring ever so slightly. You want the pixels to blend together without intersecting, which will blur out the black lines in between. Be careful, though, because this ever-so-slight blur can cause eyestrain for viewers over a long period of time.

by: Andy Grant

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