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The Indian-head test pattern is a test card that gained widespread adoption during the black-and-white television broadcasting era as an aid in the calibration of television equipment. It features a drawing of a Native American wearing a headdress surrounded by numerous graphic elements designed to test different aspects of broadcast display.
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Used since the earliest TV broadcasts, test cards were originally physical cards at which a television camera was pointed, and such cards are still often used for calibration, alignment, and matching of cameras and camcorders. From Wikimedia Commons and Present & Correct, here are some vintage test patterns:
Vector illustration of a Old fashioned tv test screen pattern for television calibration. 16:9 aspect ratio use for Full HD, 4k or higher resolution. Lot's of texture, fully editable.
A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at sign-on and sign-off).
The TV test pattern was broadcast in the 1920s. Aesthetics were not important. It was technically drafted to allow electrical engineers a guide from which to calibrate and produce a viable image. It ultimately became a nostalgic icon of the black and white TV era.