Most 4K TVs upscale 1080p badly, and nobody checks the se…

Most 4K TVs upscale 1080p badly, and nobody checks the settings that fix itxda-developers.com

Even though 4K TVs are extremely popular these days, many people still watch a surprising amount of 1080p content. Cable TV, older movies, YouTube videos, and even some streaming titles still play at 1080p. Technically, this shouldn't be a big deal since 4K TVs are designed to upscale HD content so that it fills the screen properly. The problem, however, is that 1080p content rarely looks as good as you'd expect on a 4K panel —and most of the time, it has nothing to do with the hardware doing the upscaling.

Instead, the underwhelming result usually comes down to picture settings that most people never bother to check. In fact, when I first got the LG C8 OLED TV several years ago, I was never fully satisfied with how 1080p content looked on it. The picture often appeared softer or more processed than I expected, which made me assume that the TV simply wasn't very good at upscaling. But after spending some time digging through the settings, I quickly learned that a few default options were actually working against my TV's upscaling.

Nowadays, one of the first things I always check after getting a new TV is the sharpness setting. For years, I thought increasing sharpness was the easiest way to make the image look crisper, but that's not really what this setting does. Like many of you, I assumed it simply restored detail that might get lost when lower-resolution content is displayed on a 4K panel. If 1080p content looked softer than it should, increasing sharpness felt like the obvious solution.

In reality, though, it just exaggerates edges instead of adding real detail. You can test this by moving the slider all the way to the right and looking closely at objects with clear outlines, like the edges of buildings or trees. You'll see bright halos around those edges. And once you notice that, it's hard to overlook what this setting really does. When you're already dealing with upscaled 1080p content, that extra edge enhancement can make the picture look harsher and more processed than it should, which is not what you want.

So I highly recommend setting it as close to zero as possible, depending on your TV. Most TVs today include noise reduction and MPEG noise reduction settings to clean up compression artifacts, which is often a problem while watching cable TV or heavily compressed streaming content. You may have seen these as blocky patterns, grain, or random visual noise, especially in darker scenes or fast-moving footage.

While this setting does a good job of eliminating those artifacts, it often does so by smoothing the image and blending pixels. The end result is an image that lacks fine detail, like skin texture, grass, and fabric patterns. I'm fine with 4K content looking a bit softer due to noise reduction, but the problem is that the same trade-off is much more noticeable with 1080p content. Since the TV is already trying to upscale a lower-resolution image, adding extra smoothing on top of that can make the picture look flat and overly processed.

Ideally, you should preserve as much fine detail as possible from the 1080p footage rather than further smoothing it out. For a more natural look, it's best to disable these settings completely. Just like noise reduction, many TVs offer motion smoothing to make fast-moving scenes appear smoother. Manufacturers like Sony, LG, and Samsung have their own names for it, like MotionFlow, TruMotion, or Auto Motion Plus.

Regardless of the marketing term, the idea behind it is the same. The TV inserts artificial frames between the original ones to make motion appear smoother than it actually is, similar to how DLSS frame generation works in games. This changes how movies and shows are meant to look. Instead of the natural 24FPS motion you'd expect from movies, everything feels unnaturally smooth, which is why it's called the soap opera effect.

The main downside of relying on motion smoothing is that it introduces visual artifacts around moving objects, as the TV essentially guesses what the intermediate frames should look like. When you're already watching 1080p content that's being upscaled to a 4K panel, adding frame interpolation on top of that can make the image look even more processed. Disabling it restores a more natural-looking picture that stays closer to the original footage.

If 1080p content doesn't look as good as you expected on your 4K TV, the problem often isn't the upscaling itself but the amount of image processing happening behind the scenes. Sharpness setting, MPEG noise reduction, and motion smoothing can all make the picture look more artificial than it should. Sure, they may be worth using when consuming 4K content, but when your TV is already upscaling low-resolution footage, you're better off preserving as much detail as possible rather than letting extra processing get in the way.

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