HDR stands for High Dynamic Range, and SDR stands for Standard Dynamic Range. Nearly every TV on the market in 2026 supports HDR, but just what is it, and what's the difference between HDR vs SDR video formats? HDR allows TVs to display a wider range of color and luminance, resulting in deeper blacks and brighter whites, and more luminous, vibrant colors. It's a fundamentally new way for content creators to master their content to help them deliver their cinematic vision more accurately to you at home. In this guide, we'll break down the key differences between SDR and HDR, and what you should look for when choosing a new TV.
What Is HDR?
Before we get into the details of HDR vs SDR, let's start with the basics: What is HDR? HDR stands for High Dynamic Range. Dynamic range is the variation of light within an image, so in the context of a TV, this means that one with a high dynamic range can display a wider range of light and colors compared to an SDR display. This greater range results in a far more vivid, realistic image, with deeper blacks and brighter whites, and more life-like colors.
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You can see an example above of what an HDR image looks like compared to an SDR image on the same TV. The HDR image appears more lifelike, and you can see more details, especially in darker areas of the scene, such as the shadows of the cars.
HDR also completely changes the way luminance information is sent to the screen, separating it entirely from color and encoding it in absolute terms. So if a scene is supposed to be 100 nits, the exact luminance is recorded as 100 nits, whereas in SDR, it's all relative.
HDR is a very powerful tool in a content creator's toolbox. The wider range of colors, higher peak brightness, and greater dynamic range make it much easier for the content creator to deliver their vision to viewers at home. HDR also uses metadata to give the creator more control over how the TV displays an image, helping deliver something closer to what they intended. More on that in the next section.
Metadata
At the core of most HDR content is metadata, a set of instructions embedded in every piece of content sent to the TV. It tells the TV everything it needs to display the image accurately, from which color space to use to how bright the image should be. This metadata is created when the content is mastered, so you can think of it as a sort of guide stone that tells the TV how to reproduce the content the way the content creator intended.
This metadata is essential for HDR. No TV on the market can display the entire range of colors and luminance that HDR allows for. Whereas SDR targets one very specific standard, HDR also has multiple standards, with different color spaces available for content creators to work with. This is why metadata is so important for HDR to work properly; it tells the TV how the video was created, so the TV can adapt the incoming signal to match the color space and luminance to its capabilities. This is a process known as tone mapping.
Advanced HDR Formats
There are different types of HDR signals that can be sent, and they're either static or dynamic metadata. Dynamic metadata changes on a scene-by-scene basis, while static metadata remains the same for the whole length of the movie or show you're watching. It means that if content uses dynamic metadata, it can reduce the range of brightness in the signal to allow for more fine details in a darker scene, and increase its brightness for a brighter scene to make highlights pop and allow for finer gradients in bright areas of the scene. With content that uses static metadata, the brightness range remains the same throughout, meaning some scenes can be over-brightened or not dark enough.
The two most common dynamic metadata formats, Dolby Vision and HDR10+, each use dynamic metadata, while HDR10 is a static format that forms the basis of HDR signals. Despite the name similarities, HDR10 and HDR10+ are different formats. Some TVs support the two dynamic formats, HDR10+ and Dolby Vision, while others support one but not the other.
Learn about the differences between HDR10, HDR10+, and Dolby Vision.
HDR vs. SDR
So now that we've covered what HDR is, what's the difference between HDR and SDR, and should you care?
Brightness
The biggest difference between HDR and SDR is in the way they process an image. SDR stores luminance in relative terms, and it's sent as part of the color information. In HDR, luminance is handled separately, and it's stored in absolute terms. To put this in simpler terms, in SDR, the viewer at home directly controls how bright the screen gets by adjusting the backlight setting. Image too dark? Just increase the brightness. The problem with this approach is that when you increase the backlight setting, you're increasing the brightness of everything at once. So not only do bright scenes get brighter, but dark scenes do, too.
With SDR, since you're in control, you may find yourself constantly adjusting the backlight setting not only based on when you're watching TV, but also on what you're watching. Many TVs have implemented light sensors that try to do this automatically, but they're not perfect. This also means that you're not at all respecting the creator's intent. While most SDR content is mastered at around 100 nits, unless you're in a dark room, you're probably not keeping your TV's backlight at that level. So everything you watch is brighter than what the creator intended it to be.
In HDR, brightness is dictated by the content itself. You still have some control over how bright your TV gets, and certain picture modes and settings allow you to fine-tune the range of brightness your TV produces, but the content itself tells the TV how bright it should be. The good news with that approach is that you don't need to adjust your settings with different content; dark scenes are dark, and bright scenes are bright, depending on how the content creator intended each scene to be displayed. The bad news is, if you're in a very bright room, you may find HDR content to be too dark. Again, newer TVs use light sensors to try to fix this by adjusting the brightness to match your viewing environment.
Color Gamut & Volume
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A TV's color gamut defines the range of colors it can display. There are two common color spaces used for HDR content: the DCI-P3 color space is the most widely used one, but it's also the narrowest, and the BT.2020 color space, which is much wider but also less common. SDR content is almost always mastered in BT.709 instead. Above, you can see the comparison between SDR and the BT.2020 HDR color space, with the triangle representing the range of colors defined in each color relative to the full shape. As you can see, HDR can display a much wider range of colors, especially greens, and it comes much closer to displaying the full range of colors visible to the human eye.
It's worth pointing out that very little content actually takes full advantage of the BT.2020 color space, and no TV on the market in 2026 can display the full range of colors. The DCI-P3 color space, which sits between the two shown above, is a far more realistic goal. Many TVs on the market can display their full range of colors, or close to it, and the vast majority of HDR content is mastered in that space. So getting a TV with good coverage of the DCI-P3 color space is essential for a good HDR experience.
Gradient
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Gradient handling is a bit more technical than the peak brightness and color gamut. It defines how well a TV displays colors at different shades, and this is important for scenes with a sky or sunset. If your TV has good gradient handling, the sky transitions between colors smoothly, but if it has poor gradient handling, you'll see banding that can be distracting.
Gradient handling is important for watching HDR content because HDR requires 10-bit color depth, and while most modern TVs can display a 10-bit signal, not all of them do it well. Color depth is the amount of information used to display a certain color, so a higher color depth holds more information. It's also why HDR content uses 10-bit color, while SDR has 8-bit color depth. Keep in mind that not all TVs that accept 10-bit signals have a 10-bit panel; the vast majority use 8-bit panels with dithering to display 10-bit signals, and this doesn't affect overall picture quality much.
If you look at the images above, you can see how there's much more banding in the orange sky on an 8-bit image versus a 10-bit image on the same TV. It's because 8-bit color depth has less information, meaning it can't properly display those minor color changes. Most modern TVs have good enough gradient handling, but there are a few where the banding is obvious.
Conclusion
HDR is a video format that can improve overall picture quality by introducing brighter highlights and a wider range of colors compared to SDR. The peak brightness, color gamut, and color bit depth are all important to deliver an excellent HDR experience. Some HDR content uses dynamic metadata to change the information it sends to the TV on a scene-by-scene basis so that the TV properly displays content at its correct brightness level. Nearly every modern 4k TV supports HDR, but just because it supports the metadata doesn't mean HDR content looks good, as you need a bright TV with good contrast and a wide color gamut to deliver good HDR picture quality.