Zentech DF2000 Průvodce řešením problémů stáhnout pdf (Strana 22)

Traditional analog TV has an aspect ratio of 4:3 (almost square). This means that a TV screen is 4 inches

wide for every 3 inches it is tall. Most digital televisions have an aspect ratio of 16:9 (rectangular) and are

called “widescreen.” The 16:9 aspect ratio more closely approximates the look of movies and the amount

of programming that is being offered in 16:9 is increasing.

When the aspect ratio of the television program and your television set do not match, bars on the top

and/or sides of the image may appear to ensure that the image is not distorted.

In order to properly display 16:9 content on a 4:3 set, your digital television or digital-to-analog converter

box may place bars at the top and bottom of the image – a process called “letterboxing.”

Similarly, to properly display 4:3 content on a 16:9 television set, bars may be placed on the sides of the

screen – a process called “pillar boxing.”

Also, some programs are “letterboxed” or “pillar boxed” during broadcast. For example, many

commercials are produced in analog with a 4:3 aspect ratio, but are broadcast with letterboxing for a

“modern” look or to leave room for text or subtitles. When such a commercial is aired during a widescreen

(16:9) program, it will also be pillar-boxed. This results in a 16:9 format broadcast that already has bars

above and below it. When such a broadcast is viewed on a 16:9 set, it results in bars appearing above,

below, and on the sides – a result called a “postage stamp.”

Many digital-to-analog converter boxes and digital televisions allow you to “zoom” into the image to

eliminate the bars. This may result in part of the image being cut off or “cropped.” Some digital-to-analog

converter boxes and digital televisions also provide the ability to alter the image to fit the screen, either by

“stretching” or “squeezing” the image. Please consult the owner’s manual of your digital television or

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Zentech DF2000 Průvodce řešením problémů Strana 22