4 common mistakes people make with 4K TV settings

Get a more accurate picture on your 4K TV by making sure these settings aren't messing with the picture

Samsung TV showing settings menu
(Image credit: Samsung)

So you've bought one of the best TVs, and you're thrilled to be seeing your movies in the amazing picture quality that we promised you. But if you just pulled your TV out of the box and stuck your favourite film on, you might not be seeing it at its best.

New TVs often have some pretty aggressive processing options turned on by default, and these mostly aren't necessary for you to get great quality from them. In fact, some of them explicitly hurt more than they help.

So here are the three key options you should make sure are either turned down or turned off on your TV. Obviously, all TVs will put these options in slightly different places in the menus, but they'll usually be in some kind of Picture Settings and then Advanced Settings menu.

1. Motion

All TVs today have some kind of motion processing tech built in, because it can be really useful… but not always! When we talk about motion processing, what we mean is that the TV looks at the frames of video as they come in, analyses them, and can actually create new frames that sit between the 'real' frames. 

Why would it do this? In the case of fast moving action, such as sports, adding these extra frames can really help your perception of the clarity of the image, so movement looks smoother, details (such as player's names on their shirts) are easier to see, and everything is generally easier to follow. It's especially useful when the source of the footage isn't super high-quality, such as when streaming from some services.

When this is applied to film, it's less desirable, but is sometimes necessary. Film is 24 frames per second, and TVs refresh at either 60 or 120 times per second, depending on how advanced the panel is. 60 doesn't divide cleanly into 24, which means there's no way for a film's frame rate and the TV to stay perfectly in sync, which means you see 'juddering', where movement doesn't look quite right. So motion processing steps in to try to even this juddering out, and make the film look more like it's supposed to.

However, you want the minimum amount of motion processing applied here. Many TVs will have multiple levels of motion processing, and you really only want the TV to gently nudge things into looking better, not to take over and make the motion so smooth that you get the 'soap opera effect', where everything looks weirdly glossy. Film is a slow and imperfect medium, and movies are made with that in mind.

If you're a cinephile with a 60Hz TV, you can also check whether your TV offer Black Frame Insertion. BFI is an alternative to motion processing where black frames are inserted to fill the empty frames when the film and TV are out of sync. It makes the image look darker, but keeps the motion looking as close to the original intention as possible.

If you have a TV with 120Hz screen, you should actually turn all motion processing OFF for movies. That's because 120 does divide into 24, which means you don't have any 'judder' issues. A 120 Hz TV with motion processing turned off can simply show each frame five times before showing the next, meaning you see perfect original film motion.

So the mistake with motion processing is leaving it on high. For movies you want it low for films (if your TV is 60Hz) or turned off completely (if your TV is 120Hz). For sports, feel free to crank it back on.

2. Sharpening

Just like the motion settings, some TVs will come with a sharpening effect activated and turned up high. But whereas motion is arguably a necessary evil in some cases, the sharpness setting is not. It's just overkill.

The thing to know is that any sharpness setting on your TV is on top of the natural sharpness of 4K images, and above any upscaling it's doing to HD or SD images. It's especially a danger with streamed content, which is quite compressed: a high sharpness setting will often accidentally find strange artefacts from the streaming that you'd never notice and will highlight them. Instead of crispening the edges of something, it often adds a bizarre 'halo' effect, separating an object from the background unnaturally.

It's possible with some 4K TVs that if you watch a lot of SD content, a little extra sharpness will help it to look nicer. But if you want mostly HD or 4K, just turn it off.

3. Noise reduction

This is the opposite of sharpness, in the sense that instead of adding weird artefacts that should be there, noise reduction removes weird artefacts that should be there.

Digital noise is a kind of grainy effect that can be common in areas of block colours, such as skies, or anywhere that a digital camera sensor had trouble picking up enough light. In still images, it's pretty common for digital photo processing to reduce this, so colours look cleaner.

However, movies that were shot on actual film are supposed to have grain. It's a natural part of the film material itself. Even more important, there's no way for a noise reduction algorithm to tell the difference between an imperfection in an image that's a piece of grain, and an imperfection in an image that's the texture of a piece of wood or road, or the wrinkle on someone's face.

So noise reduction will end up just smoothing everything weirdly, like it's all getting a horrible fake Instagram glow-up. Say no to noise reduction! See what your favourite actors really look like!

4. Don't go vibrant

Your TV may be turned to picture preset called 'Vibrant' or something like it out of the box, which is designed to really pump up the colours and give you some "wow" factor. You don't need any wow factor beyond what's in the movies already! Today's TVs deliver beautiful colours from the basic processing and panel tech.

What you want is accuracy to how the film was made, within the capabilities of the screen you've bought. And this tends to come from a mode called something like 'Cinema' or 'Movie'. This will often make the screen seem a little dimmer too, because a Vibrant mode will sometimes also crank up the HDR performance. This is also fine. Good even! Again, it's more like how it should look.

And while we're talking colours, if your TV offers a choice between 'Cool' and 'Warm' (with possible a 'Standard' in there too), you should go with Warm. This is basically always closer to how movies are mastered on pro monitors, so will be more accurate to (again) the original colours as intended. TV screens, like most computer monitors and other displays, tend towards a cool/blue light naturally, so setting them to a warmer tone results in a more neutral final result.

Matt is T3's former AV and Smart Home Editor (UK), master of all things audiovisual, overseeing our TV, speakers and headphones coverage. He also covered smart home products and large appliances, as well as our toys and games articles. He's can explain both what Dolby Vision IQ is and why the Lego you're building doesn't fit together the way the instructions say, so is truly invaluable. Matt has worked for tech publications for over 10 years, in print and online, including running T3's print magazine and launching its most recent redesign. He's also contributed to a huge number of tech and gaming titles over the years. Say hello if you see him roaming the halls at CES, IFA or Toy Fair. Matt now works for our sister title TechRadar.