![]() Like frame interpolation, black frame insertion has different implementations. CNET's TV reviews often find that the flicker from BFI is too intense to be worth the improvement in motion blur. There's also the potential for visible flicker, as the TV essentially flashes on and off with the inserted black frames. I have a front projector, for example, and the BFI mode can make the image look very dim. In many cases this trade-off is acceptable, as modern TVs are exceptionally bright. When the TV spends half of its time showing a black screen, its light output drops. Once again, however, there are a couple downsides. It fools your brain better into thinking there's smooth motion. With black frame insertion, there's less "hold" in the sample-and-hold. This blanking was a simple way to give some of the "performance" of a higher frame rate without the cost of additional film stock. Some cinemas went even further, showing each film frame three times. Instead, each film frame was shown twice, with a shutter blocking the light in between. This was slow enough that some people saw the flicker. Though filmed at 24 frames per second, movies weren't shown at 24 frames per second. How long this black image is shown, or whether it's completely black, varies. The TV would "insert" 60 black images in between the real images. The original video would have 60 images per second of the fish. ![]() At its most basic, and where the technique gets its name, what happens is, a black frame is inserted between the real frames.Ī simplified illustration of black frame insertion. The general term is black frame insertion, but this broadly covers a lot of different ways to produce a similar effect. Black frame insertionįortunately for people who hate the soap opera effect, there's another method to reduce motion blur. Some even separate out the processing to reduce the judder caused by putting 24fps content on a 60fps display. If your TV has this adjustment, it's worth playing with to see if you can find a setting that reduces motion blur enough that you're not bothered by it, but isn't as intrusive as the more intense frame interpolation modes are. So instead of a created frame that's halfway between A and B, maybe it's only slightly different from A or slightly different than B. If they wanted to record at 48fps, they'd have recorded at 48fps, like Peter Jackson did with The Hobbit.įortunately, most TVs not only give you the option to turn it off, but let you adjust how intense the frame interpolation is. Most Hollywood creators hate it, too, because it isn't what the director intended for his or her creative vision. The ultrasmooth motion is not just artificial-looking, but can be distracting and unpleasant. Many people don't notice, or don't care, about the soap opera effect. I’m taking a quick break from filming to tell you the best way to watch Mission: Impossible Fallout (or any movie you love) at home. For instance, if a ball is on the left side of the screen in frame A, and the right side of the screen in frame B, the TV could safely assume that if there was a frame between A and B, the ball would be in the center of the screen. The processing in modern TVs can determine, with a surprising amount of accuracy, what happens in between two frames of video. Motion interpolation: What causes the soap opera effect You need something to change to, and that's when things get interesting. The images are still being held, and if you just double the number of still images to fit 60 into 120 you haven't really changed anything. Higher refresh rates don't, in and of themselves, fix the motion blur problem. Max out at 120Hz, but in the 1080p days, there were models up to 240Hz (or 100 and 200Hz, depending what country you live in). ![]() ![]() It's the main reason for higher refresh rates. TV manufacturers have known about the motion blur issue for years. ![]()
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