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The Importance of 4:3 Center-cut Safe

May 27, 2015
4:3 Center-cut Safe

The introduction of high definition television super-sized our television sets from the square look of the 4:3 aspect ratio, to the widescreen 16:9 ratio. If you acquire your content in HD, the natural instinct when shooting HD is to use the entire 16:9 frame for composing your shots.

Not so fast.

Currently, most televisions networks in US markets do broadcast in HD. However, since there are still a significant amount of 4:3 television sets still in use, every one of these HD stations also simultaneously feed SD signals of their of their content to their SD viewers. In fact, the majority of the US viewership is actually watching in SD. This means your cinematic 16:9 content is being down-converted to the 4:3 screen ratio for SD viewers.

For more on down conversion methods, please visit our blog post on Being Mindful of Broadcast Down Conversion.

If your final program is heading to broadcast on television, it is important to know how your content may actually be seen by your audience (both HD and SD) and how you can prepare your final cut so that it is optimized and looks the best in both formats.

Creating 4:3 Center-cut Safe Content

In order to be eligible for this often requisite method of down-conversion, your picture (and graphics) need to be center-cut safe.

Creating center-cut safe content starts with proper framing of your talent during production and correct location for your graphics in post. Follow these simple steps to create content that can handle the inevitable down-conversion of your HD content.

  • Shoot protect for “4:3 Visible Area.” Keep all important framing/content in the center 3/4 of the 16:9 screen width when capturing footage.
  • Create graphic elements that do not exceed the center 2/3 of the screen width (4:3 safe area).
  • Edit your program using our center-cut safe template dropped on your timeline over your footage.
Center-cut Safe Template
Center-cut Safe Template (click image for a full-resolution downloadable template)

"4:3 Safe" is when you center all critical content into the center 70% of the HD screen width. This will accommodate for the center-cutting of the 16:9 image to the 4:3 full screen aspect ratio during the required down conversion of a HD signal when distributing to a SD set-top box or television.

Why is this important? Old tube (CRT) televisions were designed with significant over-scan built-in (5-10%) to hide a variety of picture imperfections due to design, manufacturing, and technology limitations. As these sets aged a variety of other mechanical issues would cause the scanning area to change or grow. The rule of thumb is still to accommodate for the lowest common denominator, which in this case is the tube television.

The results:

4:3 safe 16:9 image on an HDTV
4:3 safe 16:9 image on an HDTV
4:3 safe 16:9 image center-cut on a tube TV set
4:3 safe 16:9 image center-cut on a tube TV set
4:3 safe center-cut image on an HDTV
4:3 safe center-cut image on an HDTV

A clean, professional looking image displayed properly across all broadcast outlets.

We'll take it from there. Submit your program to Aberdeen for the final broadcast QC, closed captioning, and AberFast station specific transcoding and file distribution. 


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