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Most smart TVs ship with picture settings that work acceptably, so the goal is not to undo the factory defaults. The five settings below are the ones most worth checking when a picture looks too smooth, too dim, stretched, or short of 4K HDR. Each one depends on your model, firmware, input, and viewing room, so if a label here does not match your menu, search your manual for the closest term.
Before you change anything
Picture quality is a combination of the TV, the content you are watching, the light in the room, reflections on the screen, the picture settings, and your own preference. LG’s official guidance makes this point directly: room lighting, screen reflectance, picture settings, and the content all affect what you see. That means a setting that looks wrong in a bright living room may be correct in a dark one.
- Photograph the current picture and energy menus before you change anything, so you can return to the starting point.
- Change one setting at a time and judge it with content you actually watch, such as a film you know well or a live sports broadcast.
- Do not copy numeric calibration values from forums or other people’s TVs. No single set of numbers suits every television, room, or viewer.
1. Choose a picture mode that fits the room and the content
The picture mode is the starting point for everything else. LG’s guidance says the right mode depends on the viewing environment, your preference, and the type of video, and it gives different examples for natural light, artificial light, and a dark room. Most TVs offer a cinema or filmmaker-oriented mode, which is usually the most neutral choice for films.
- Open the picture settings menu, usually labelled Picture or Picture Mode.
- Select a cinema or filmmaker-oriented mode for movies, if your TV offers one.
- Adjust brightness for the room. A bright, sunlit room needs more light from the screen; a dark room usually looks better with less.
- Watch a scene with both dark and bright areas, then adjust once more if shadows look crushed or highlights look washed out.
2. Turn motion smoothing off, or reduce it, for film
Motion smoothing inserts extra frames to make movement look fluid. It is the most common cause of the “soap opera” look, where a film looks like a cheap video recording. Samsung names this feature Auto Motion Plus or Picture Clarity, and its support pages describe Off and Custom choices. Samsung’s support page for motion smoothing, undated, states that most movies are filmed at 24 frames per second and are not intended to be viewed with these features. It also says live TV such as sporting events or parades is typically filmed at 30 frames per second, and that smoothing can be useful for fast-moving live content.
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A practical approach follows from that:
- Films and scripted shows: set smoothing to Off, or the lowest available level, and compare the result on a known scene.
- Live sport: if fast motion blurs the ball or players, try a low or custom setting and see whether the blur improves without the image looking artificial.
Labels vary. LG uses its own picture clarity controls, so look for the feature that governs frame interpolation or motion processing in your menu.
3. Check energy-saving brightness before calibrating
If the screen looks unexpectedly dim, the cause may be an energy function rather than the picture mode. Samsung’s support page on energy saving mode, last updated 30 March 2022 for the UK version, documents ambient-light brightness optimisation, brightness reduction, and motion lighting. The same page explains that some of these settings can conflict with Adaptive Picture, so turning one on can change what another control does.
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- Breathtaking picture: Sharp 4K brings out rich detail on our 55" flat screen TV, while the QLED screen and HDR10 create bright, accurate colors. Roku Smart Picture cleans up incoming TV signals, optimizes them, and chooses the right picture mode.
- Seamless streaming: With fast Wi-Fi and apps that launch in a snap, Roku Select Series TVs get you to your entertainment quickly. You get excellent picture quality, clear sound, automatic updates, and more. It’s simple to use. Hard to outgrow.
- TV, simplified: With setup that only takes minutes, a simple-to-navigate Home Screen, and an uncluttered remote control that does all you need—Roku makes it easier to watch the TV you love.
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- Check ambient-light brightness optimisation, brightness reduction, and motion lighting first if the picture is too dark.
- Only then adjust brightness in the picture mode.
- Brighter output uses more power. Whether to keep a reduction setting is a trade-off between comfort, room conditions, and energy use. You do not need to switch every energy option off to get a good picture.
4. Match the aspect ratio or picture size to the source
Aspect ratio controls how the image fills the screen. LG lists Aspect Ratio as a control that changes screen size according to the content type. The correct choice depends on how the source is formatted, so there is no single right answer.
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- Black bars at the top and bottom can be correct. Many films are letterboxed to preserve their original proportions.
- Faces that look wide or squashed, or subtitles and logos that disappear off the edge, point to stretching or zooming. Switch to the original or fit option for that input.
- If the picture is cropped on one device but not another, check the picture size setting for each input separately.
5. Enable the HDMI mode for 4K HDR on each input
A player, console, or streaming box that does not show 4K HDR is often limited by the TV’s HDMI setting rather than by the source itself. Roku’s support page on 4K Ultra HD and HDR settings, last updated 7 July 2026 for the Canadian version, states: “Incorrect HDMI settings on your TV or an incompatible HDMI port may cause your streaming player to only play 1080p even when your TV is capable of 4K HDR or 4K Dolby Vision.” Some capabilities are also specific to particular inputs, so the setting must be enabled on the port the device is plugged into.
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- Confirm the source is set to output 4K and HDR, and that its own display settings show the format.
- On the TV, open the input or source settings for the port in use and enable the enhanced or HDMI 2.0-or-later option for that input. The label varies by brand and model, so check your manual.
- If a receiver or soundbar sits between the source and the TV, confirm it also supports the format. A link that does not pass 4K HDR will limit the picture regardless of the TV setting.
- Play a known HDR title and check the source’s display information to confirm the output.
When the cable is the problem
Roku states that its supported HDR players ship with an HDMI 2.0-compatible cable. It recommends a premium high-speed or ultra high-speed cable only where a replacement is needed, for example when an existing cable is damaged or inadequate for the chain. A new cable also cannot help if the TV port or the source does not support the target format. Most readers who have a working cable and a supported port do not need to buy one.
Optional: soundbar or receiver not playing TV audio
This is a connection fix rather than a picture setting, so check it only if sound is missing or coming from the TV speakers.
Rank #4
- CRYSTAL PROCESSOR: Powerful processor enhances colors and sharpens details for a vibrant 4K viewing experience. Experience every shade of color as it was meant to be seen in dazzling 4K. Plus, make your movies, TV shows, games and sports look even better with powerful 4K upscaling.
- ENDLESS FREE CONTENT: Watch 2,700+ free streaming options, including 750+ subscription-free channels on Samsung TV Plus. Enjoy news, sports, movies, kids' shows and reality TV — all without a subscription. Discover endless entertainment with new content added regularly, tailored to your mood and interests.*
- MOTION XCELERATOR: Experience clear picture and smooth motion in games and sports. Enjoy smooth motion and clear visuals with technology that estimates and adjusts frame transitions in real time. Whether gaming or watching sports, enjoy up to 4K 60Hz performance that brings every play, move and scene to life with realistic clarity and motion.
- COLOR BOOSTER: Supercharge your color. From fiery reds to sparkling blues, make every color come to life with intensity. Color Booster transforms your content into a visual masterpiece.
- 4K UPSCALING: Upgrades what you watch to crisp 4K clarity. Upgrade your favorite shows, movies and more. Experience incredible details and clarity in every frame, even from lower-quality sources, with advanced upscaling technology.
- Connect the external soundbar or receiver to the TV port labelled ARC or eARC.
- In the TV’s sound settings, select that device as the output.
- Enable HDMI-CEC if the device is not responding to the TV’s volume or power controls. Brand names include Samsung Anynet+, LG SIMPLINK, and Sony BRAVIA Sync.
Roku’s support page on HDMI-CEC and ARC, last updated 25 February 2026 for the UK version, documents these steps using Roku playback and example brand menus. Your menu names may differ.
Quick guide: symptom to first check
| What you see | Check first | Section |
|---|---|---|
| Films look like video recordings | Motion smoothing set to Off or low | 2 |
| Picture is too dim | Energy-saving brightness options, then picture mode brightness | 3 |
| Image looks stretched, zoomed, or cropped | Aspect ratio or picture size for that input | 4 |
| Streaming stuck at 1080p on a 4K HDR TV | HDMI enhanced option for the port, then the source and any receiver | 5 |
| No TV sound through the soundbar | ARC or eARC port, sound output selection, HDMI-CEC | Optional |
What to leave alone
Not every factory default is wrong. Picture mode, brightness, and energy options are personal choices, and a bright setting can look better in one room and worse in another. Change only what a specific symptom points to. The guidance above comes from manufacturer support pages rather than independent lab testing, so use the menu names and paths as examples of what to look for, and let your own eyes decide the final setting.
Quick Recap
Best Value
- A treat for the eyes: Sharp 4K brings out rich detail on our 43" flat screen TV, while colors pop off in lifelike clarity with HDR10. Roku Smart Picture cleans up incoming TV signals, optimizes them, and chooses the right picture mode.
- Seamless streaming: With fast Wi-Fi and apps that launch in a snap, Roku Select Series TVs get you to your entertainment quickly. You get excellent picture quality, clear sound, automatic updates, and more. It’s simple to use. Hard to outgrow.
- TV, simplified: With setup that only takes minutes, a simple-to-navigate Home Screen, and an uncluttered remote control that does all you need—Roku makes it easier to watch the TV you love.
- A world of free entertainment: Enjoy a huge selection of free live TV, news, sports, movies, shows, and much more—all just a click away.
- More streaming, less searching: With personalized picks right on your Home Screen, quick access to the sports and entertainment you watch most, and fast and easy search in one place—the days of endless scrolling are over.
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