What does Pillarboxing mean?
Pillarboxing places unused areas at the left and right when a narrower picture is shown on a wider screen without distortion. Older 4:3 television material commonly produces this presentation on a 16:9 display.
Why it matters
The side areas preserve the source’s proportions. Stretching can remove them but makes people and circular objects too wide. Some programmes already contain side padding, while others rely on the player to add it. This distinction matters when a source is further letterboxed or viewed on an ultrawide monitor, because multiple layers of padding can surround the actual scene.
A practical example
An archive interview should not be stretched merely because the modern studio programme around it fills the screen. Different segments can intentionally retain different shapes, and preserving the narrower insert may be more faithful than forcing every moment into the same geometry.
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Related terminology: Picture-in-picture, Pixel aspect ratio.
For practical setup and troubleshooting, browse the journal or support guides.