In life, whether it is a computer monitor, smartphone or TV, you may have seen the “HDR” in them, so do you understand what HDR is? Next, I will take you from the definition of HDR, working principle and its advantages and other aspects, to bring you a comprehensive understanding of HDR related knowledge.
What is HDR?
HDR stands for High Dynamic Range, which refers to a technology that can show the details of content in extremely bright and dark scenes.
HDR technology changes the way colors are presented in the signal, making highlights appear brighter and more detailed, and shadows darker and more detailed, and colors more intense.
So whether you’re in a bright or dimly lit room, HDR is able to clearly render details in both the brightest and darkest parts of the image. In short, HDR makes things look more real, more vivid & lifelike.
How HDR works
HDR technology works by capturing multiple versions of the same scene at different exposures, such as taking a picture three times: once bright, once dark, and once at medium brightness. The HDR technology then combines these images to show a photo that is balanced between light and dark. The technical principle of this process is as follows:
Capturing multiple exposures
HDR will first take multiple exposures of the same scene. Typically these exposures will use different bracketing levels (underexposed, correctly exposed, overexposed). This ensures that the camera captures detail in the brightest and darkest areas.
Tone Mapping
Once multiple exposures have been captured, tone mapping is used to combine them into a single image. Tone mapping converts the high dynamic range captured by the camera into the limited dynamic range of the monitor.
HDR selectively compresses or expands luminance values to preserve detail, especially in midtones, highlights, and shadows.
Wide Color Gamut (WCG)
This is a key component. The color gamut represents all the colors that an LED display or projector can show. So the larger the color gamut, the more colors the device can display.
So HDR content uses extended color spaces to render more vibrant and accurate colors. These color spaces allow HDR displays to more closely resemble the colors of natural visible light to the human eye.
Nits and Brightness
HDR displays have brightness levels of up to 1,000 nits or higher. Higher nits levels are important for displaying bright highlights without over-rendering detail.
Bit Depth
HDR typically uses a 10-bit or even 12-bit color depth and is therefore capable of displaying billions of colors. This reduces the number of distinct transitions between colors, resulting in smoother gradations and more colorful visuals.
Display Technology
HDR displays support the use of advanced technologies such as quantum dots, OLED panels, and local dimming to achieve the necessary contrast and brightness.
OLEDs, for example, provide perfect black levels by turning off individual pixels, while Quantum Dot Enhanced LCDs achieve higher brightness and more vibrant colors.
Advantages of HDR
In today’s era of pursuing technological experience, HDR technology has unique charms and advantages. Below I will explain its advantages in terms of picture quality, details, viewing experience and more.
Picture Quality
In terms of picture quality, HDR delivers brighter highlights, darker shadows, and more vibrant colors. So whether you’re watching a movie or browsing photos, HDR delivers better picture quality and a more realistic image.
Details
In terms of detail, HDR’s enhanced detail ensures that no detail is lost in bright environments or dark shadows. And it reveals a richer picture of the scene, just as you would see it in life.
Viewing Experience
Whether you’re playing a game or watching a movie, HDR provides an immersive viewing experience, thanks to its lifelike visuals and crisp image quality.
Peak Brightness
Peak brightness is measured in nits and indicates the brightness of a display. Better HDR performance usually requires 600–1000 nits, with higher ends reaching 1500–2000 nits or even higher. Analyzed in terms of peak brightness, peak brightness allows for relatively small bright areas of an image to variable and still not affect surrounding areas.
It’s like a single star gets brighter, but the surrounding night sky remains dark. If the Peak Brightness is higher, then more experienced highlights can be rendered in scenes such as explosions, sunlight, or reflections.
Black Level Performance
HDR technology allows dark details to be better preserved and displayed by expanding the image and brightness range. As a result, HDR monitors have a purer black performance and higher contrast. This enhances the three-dimensionality and layering of the image.
Color Volume
This refers to the number of colors an HDR monitor can render at different brightness levels. Quality HDR TVs and LED displays are able to maintain accurate colors even in very bright or dark scenes.
Gaming Usability
HDR can significantly improve the picture quality of gaming applications. HDR not only improves the visual effect of the game, but also enhances the gaming experience.
Types of HDR Formats
It is well known that HDR can improve picture quality, but there are actually many types of HDR formats did you know? The most widely used HDR formats are Dolby Vision, HDR10, HDR10+ and HLG to name a few. We’ll take a look at each of these four formats next:
Dolby Vision
Dolby Vision is a proprietary HDR video format developed by Dolby, and it is a licensed format that must be certified by Dolby for compatible devices.
It is standardized to use dynamic metadata to adjust brightness levels between scenes, and even between frames, meaning that it retains more detail in the shadows of darker scenes and in the highlights of heavier scenes.
This not only allows for more precise control over how content is displayed, but also deeper contrast and more accurate color reproduction.
HDR10
HDR10 is the most basic and widely used HDR format of the three, and is often considered the base standard for HDR-enabled devices. Unlike Dolby Vision, HDR10 uses static metadata, meaning that a fixed set of brightness and contrast settings need to be used throughout the video.
And the HDR10 format supports up to 1,000 nits of brightness and 10-bit color depth with about 1.07 billion colors. Unlike Dolby Vision, HDR is an open standard, which means manufacturers don’t need to pay a license fee to use it.
HDR10+
The format HDR10+ was developed by Samsung and it is a newer version of the HDR10 standard. This format supports higher color and contrast as well as dynamic metadata, allowing for scene-by-scene and even frame-by-frame adjustments to brightness levels.
Dynamic metadata provides more color information than HDR10’s standard metadata and also supports brightness levels up to 4,000 nits.
HLG (Hybrid Log Gamma)
Hybrid Log Gamma was jointly developed by the BBC and NKN Japan. Because HLG is designed specifically for broadcast use, it is being used by some broadcasters. Technically, HLG is more versatile because HLG does not use metadata at all; instead, it uses a combination of gamma and logarithmic curves.
HDR vs. SDR
SDR (Standard Dynamic Range) is the current standard for most video and theater displays, it works reliably but has limited capabilities. Compare HDR and SDR together:
First, when it comes to color and detail, HDR captures and is able to render a wider range of colors and finer details, resulting in vivid and lifelike visuals. But SDR supports a narrower range of colors, so it produces flat, undynamic images.
Secondly, in terms of brightness and contrast, HDR is able to preserve highlight and shadow details despite extremely bright or dark scenes. In contrast, SDR typically clips bright highlights and compresses shadows, resulting in a loss of detail.
Finally, in terms of dynamic range, HDR offers a higher grade of dynamic range, so it can provide more brightness and shadow detail. Overall, HDR allows you to see more detail and color in high dynamic range scenes.
Applications of HDR
With the advancement of HDR technology, HDR has a wide range of applications. It is mainly used in photography, video production, gaming, and many other applications. Let’s expand on its role in each of these areas.
Photography
Nowadays, most cameras are equipped with HDR mode. When HDR is turned on, the camera can balance the light and dark areas, which results in a great shooting effect. HDR mode is especially useful in scenes with complex lighting conditions, such as sunsets or low light scenes.
Video Production
HDR video effects are widely used in movies, TV shows and online content. It allows film and TV creators to present richer visuals, making action scenes more intense and spectacular, and dramatic moments immersive.
Gaming
HDR has also become vital in gaming. It enhances the gaming experience by not only making virtual environments more realistic, but also by improving the overall visual experience.
At the same time, manufacturers are faced with new challenges and opportunities that require them to invest a lot of time and cost. However, the widespread use of HDR brings them more economic benefits, thus breaking even.
Electronic display devices
Cell Phones
Most cell phones nowadays have a built-in camera HDR mode that is automatically turned on in poor lighting conditions.The HDR photo function is very effective in outdoor scenes with strong lighting or contrasts between light and dark, just like backlighting and landscape photography. In these scenes, HDR technology can significantly improve the image quality and look and feel of the photo.
TVs
HDR-compatible TVs now display richer colors, better contrast, more vivid images, and fuller details for more realistic viewing. In addition, HDR TVs also support a variety of formats such as HDR10, HDR10+, Dolby Vision, HLG, etc. These formats not only provide different brightness and color performance, but also meet the different needs of customers.
Monitor
HDR technology is also applicable to computer monitors, especially professional computer monitors used for graphic design, video editing and gaming.
For example, in film and video production and post-production, HDR monitors can accurately display color and brightness information during filming, which can help producers make better color corrections and picture adjustments.
HDR not only brings vivid brightness, deep blacks, and rich colors to the monitor, but also presents richer and more detailed image details.
LED Display
The core technology of HDR technology is its ability to provide higher brightness, a wider wide color gamut, and deeper contrast, characteristics that make images on LED displays fuller in detail and more realistic and vivid.
HDR technology-compatible LED displays can achieve higher peak brightness than ordinary displays. This means that on outdoor billboards or large-scale live sports event screens, viewers can see the content clearly even when there is bright light, and will not lose sight of the picture details because of the bright light.
Streaming Platforms
HDR streaming of select movies is available on Netflix, Amazon Prime Video, and other major streaming platforms such as Hulu, Paramount+, Rakuten TV, Apple TV+, and Disney+. This means viewers can enjoy richer colors, sharper contrast and an immersive visual experience.
Physical media
For those who prefer physical media, the picture quality of HDR Blu-ray discs is superb. This is because streaming media may compress the video to reduce the file size, but HDR Blu-ray Discs retain every pixel detail. If you are looking for the ultimate viewing experience, then HDR Blu-ray Disc is a good choice.
Question Answer.
Is HDR video better quality?
Yes, HDR video has better picture quality when compared to standard digital video. HDR video also has a more vivid contrast between dark and light, making it an immersive viewing experience.
Which devices support HDR?
Many devices on the market today support HDR, including smart TVs, LED displays, Ultra HD Blu-ray players, and most 4K streaming devices.
How do I watch HDR movies and TV shows?
To watch HDR movies and TV shows, you need an HDR-capable display and access to HDR-encoded content.
Is Dolby Vision better than HDR10+?
The main advantages of Dolby Vision over HDR 10 are the same as those of HDR10+, and technically there is no significant advantage to either.
When it comes to content, though, Dolby Vision is more popular. More and more studios are supporting Dolby Vision on Ultra HD Blu-ray discs, and more and more streamers are using it.
Do video games support HDR?
Video games support HDR, but not only that, HDR can significantly improve the quality of game graphics and the immersive experience of playing a game.
Conclusion
Overall, in the age of visualization, HDR technology can help you see the world in a more intimate way, whether it’s in photography, video production, or gaming.
In conclusion, I hope that you have read this article and found it helpful to have a clear understanding of what HDR is and how it works, its advantages, and more.
