While the majority of everything is completely digital from end-to-end now, there are still some analog-to-digital conversions going on. Analog has no way to attach additional information to the picture like digital does (metadata), so this data is tucked neatly into things like blinking pixels or scan lines-think of it as Morse code for TVs. Since the outside area isn’t going to be viewed anyway (in most cases), it’s used to house important data for analog-to-digital converters. Overscan also serves another, lesser-known purpose. So if overscan is so unnecessary–and bad for picture quality-why do HDTVs still use it? While not a simple concept, TVs still use overscan because content creators still use it, and TV manufacturers have to follow their lead. In addition, if you hook up a PC to your TV-say, for use as a home theater PC or for gaming-it’ll often cut off part of the taskbar or menus, making it difficult to use. Think about it: If you have a video that measures 1920×1080 pixels, and a TV screen that measures 1920×1080 pixels, but your screen is zooming in–you aren’t getting that perfect pixel-for-pixel image. Overscan is not required by any modern “fixed-pixel” high-definition televisions, like LCDs. In fact, the crop-and-zoom method of overscan often reduces picture quality, making it something that is not only unrequired, but undesirable. In other words: it’s complicated, a real pain to deal with, and none of the same rules apply today. This sort of standardization gave producers and directors a guideline to go by so nothing valuable was lost, but also ensure that nothing was left on-set that would later show up on-screen for televisions that showed more of the picture than others. Action Safe: The larger part of the viewing area, which was defined by the highest TV set calibration.Tile Safe: The area that virtually all televisions would show, confirming that no text would be cut off. In fact, content creators defined three areas of all displays so they could make sure all content would display correctly:
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