![]() Colors that appear on this second palette are never converted into yellow when the first-down line is drawn. These colors will automatically be converted into yellow when the line is drawn on to the field.Īll of the other colors that could show up on the field-things like uniforms, shoes, footballs, and penalty flags-go into a separate palette. One palette contains the colors-usually greens and browns-that naturally occur on the field’s turf. To integrate the line onto the field of play, the technicians and their computers put together two separate color palettes before each game. This effect is fairly straightforward, but it’s difficult to achieve. ![]() Instead, it looks like the player’s cleat is positioned on top of an actual painted line. ![]() When you watch a football game on television, you’ll notice that the first-down line appears to actually be painted on the field if a player or official crosses the line, he doesn’t turn yellow. (According to How Stuff Works, the computers recalculate the perspective 30 times per second as the camera moves.)Īfter they get their hands on all of this information, the folks in the graphics truck know where to put the first-down line, but that’s only part of the task. These readings allow the computers in the truck to process exactly where each camera is within the 3D model and the perspective of each camera. ![]() On game day, each camera used in the broadcast contains sensors that record its location, tilt, pan, and zoom and transmit this data to the network’s graphics truck in the stadium’s parking lot. These models of the field help sidestep the rest of the technological challenges inherent to putting a line on the field. Each field has its own unique contours, so before the season begins, broadcasters need to get a 3D model of each stadium’s field. While a football field may look flat to the naked eye, it’s actually subtly curved with a crown in the middle to help rainwater flow away. Long before the game begins, technicians make a digital 3D model of the field, including all of the yard lines. It takes lots of computers, sensors, and smart technicians to make this little yellow line happen. (Sportvision is still kicking, and ESPN acquired all of PVI’s intellectual property in December 2010.) BUT HOW DOES IT WORK? A couple of months later, rival company Princeton Video Image unveiled its Yellow Down Line system during a Steelers-Lions broadcast on CBS. The idea of using a line to mark the first down in football was a natural extension, and Sportvision debuted its 1st and Ten system during ESPN’s broadcast of a Bengals-Ravens tilt on September 27, 1998. However, the system inspired producers to think of new ways to insert computerized images into live sports broadcasts. ![]() FoxTrax-which hockey fans no doubt remember as the much-maligned “technopuck” that debuted in 1996-employed a system of cameras and sensors around a hockey rink to place a little blue halo around the puck.įoxTrax wasn't a great fit for NHL broadcasts: Hockey purists hated the intrusion into their game, and casual fans didn’t flock to hockey just because the puck was suddenly easier to follow. John’s 2009 book The Billion Dollar Game: Behind the Scenes of the Greatest Day in American Sport - Super Bowl Sunday, the first-down line actually emerged from the ashes of one of sports broadcasting’s bigger debacles: the FoxTrax system for hockey, which was designed by a company called Sportvision. Let’s have a look at the background and mechanics behind every football fan’s shining beacon: the yellow first-down line.Īccording to Allen St. If you attend a Super Bowl party on Sunday, you’ll probably hear at least one casual football viewer ask, “How do they get that yellow first-down line on the field?” While “magic” is a fine answer in its own right, the real explanation is a bit more technologically intense. ![]()
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