HDR in Xiaomi camera: full analysis of the technology

Today’s Xiaomi, Redmi and POCO smartphones feature complex computational image processing algorithms that are often hidden from the user’s eyes automatically. One of the most visible but not always understood tools is HDR (High Dynamic Range). Many owners notice the “HDR” icon in the corner of the viewfinder and wonder what exactly does this feature do and why sometimes photos with it look worse than without it?

In this article, we will discuss in detail the principle of operation of extended dynamic range in the MIUI and HyperOS ecosystem. You will learn how the smartphone processor synthesizes an image from several frames and in which situations it is better to forcibly disable this feature for a better result.

The principle of HDR in mobile photography

HDR technology is designed to address one of the main problems with smartphone arrays, limited dynamic range. When you take a picture in contrast light, such as against the bright sun or in a dark room with a window, the camera cannot simultaneously correctly expose both light and dark areas. Conventional shooting mode will choose the average value, which will make the sky become a white spot, and shadows turn into black noise.

Xiaomi's algorithm solves this problem by creating a series of images with different exposures in fractions of a second. Usually three frames are taken: one underexposed (for light areas), one overexposed (for shadows) and one with normal exposure. Then the image processor (ISP) or NPU neural engine combines the best parts of each frame into one final photo. The key difference in Xiaomi's implementation is the aggressive use of artificial intelligence to smooth transitions between exposures, which sometimes leads to an unnatural look.

The result is an image where you can see details in both the clouds and the darkened corners of the room, but this process takes computing resources and time, which imposes limitations on use cases. If the subject moves, the algorithm may not be able to synchronize the frames to create artifacts.

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HDR in Xiaomi smartphones is not a single shot, but the result of the synthesis of several frames with different brightness to save details in lights and shadows.

When to activate HDR mode

Understanding when HDR is really needed will help you take better photos. In automatic mode, Xiaomi's camera decides when to turn it on, but the algorithm is not always perfect. Forced activation of the mode is justified in situations where the brightness difference in the frame is too large for standard exposure.

First of all, it's skyscape photography, if you take a cityscape or a mountain in the afternoon without HDR, the sky is likely to be overlit, and it's also critical when you're shooting against light (contrast) when the object is in the shade and the background is brightly lit, and without expanding the dynamic range, the object will turn into a silhouette.

Another scenario is windowed interiors. When you shoot indoors during the day, the window often becomes a white light source that hides the view behind it. HDR allows you to keep the texture of the curtains and the view from the window without making the room too dark. However, it is worth remembering that in low light (at night), this mode can create digital noise when trying to brighten the shadows.

• 🌅 Landscapes with bright sky and dark earth to preserve details of clouds.
• 👤 Portraits against light so that the face does not turn into a black silhouette.
• 🏠 Interiors with windows to balance the light inside and out.
• 🌳 Scenes with deep shadows and bright highlights, such as a forest with the sun breaking through.

⚠️ Attention: Use HDR When shooting moving objects (children, animals, sports) often leads to the appearance of “double” or blur, since the algorithm does not have time to combine frames.

Why HDR photos can be blurry

One of the most common problems faced by Xiaomi users is the lubrication or blurring of photos taken in HDR mode. This phenomenon, known as “ghosting” (ghosting effect), occurs due to the desynchronization of the frames of the series. Since the camera takes several pictures in a row, any movement of the object or shaking of hands between these frames leads to the fact that the processor cannot perfectly superimpose them on each other.

In the low-end models of Redmi and POCO, frame processing speeds can be lower than in Xiaomi flagships. If you hold the phone not still enough or the subject moves quickly, the algorithm tries to "average" the position of the object, which gives the effect of smearing. In addition, in low light, the shutter speed of each frame increases, which increases the risk of hand lubrication.

Sometimes the problem is software, and aggressive noise cancellation, which often comes in tandem with HDR, can blur out fine details to make a photo look like a watercolor pattern, and in those cases, you should try switching to Pro mode or using third-party apps where you can control shutter speed.

How to turn on and configure HDR in Xiaomi camera

Control of the extended dynamic range in the shells MIUI and HyperOS is implemented quite simply, but has its own nuances. By default, the camera is often in HDR Auto mode, where the smartphone decides on the need for processing. To fully control the shooting process, it is recommended to switch to manual activation mode.

To change the settings, open the Camera app. At the top of the screen, you'll see an HDR icon. When you click on it, you'll cycle between off, on, and Auto. In some updated versions of the interface, this switch may be in the top menu, which is swiped down or clicked on a three-bar icon.

For a more subtle setup, if your phone model supports Pro mode, you can access advanced settings. However, it is worth noting that in Pro mode, the classic HDR algorithm is often not available, since here the user controls shutter speed and ISO. For using computational HDR, it is better to stay in Photo or Video mode.

Quality Comparison: HDR vs. Normal mode

To understand the real difference, it's useful to look at how the final image changes. In normal mode, the matrix captures the scene at a time, which often leads to loss of information at the extreme points of brightness. HDR expands this range, but the price for this is processing time and possible artifacts.

Below is a chart showing the main differences in shooting results under different conditions. Note that in static scenes, the advantage of extended range mode is obvious, but dynamically it loses.

It is important to note that Xiaomi’s current flagships, the 13 and 14 series, use more advanced algorithms that minimize the difference between modes in automation, but in the mid-segment, manual control provides a noticeable improvement in quality in difficult light conditions.

Common problems and their solution

Despite the usefulness of the feature, users sometimes experience HDR malfunction. The camera can "hang" for a few seconds after pressing the down button while the image synthesis process is underway. This is normal for complex scenes, but if the delay becomes critical, try closing the background applications or restarting the device.

Another problem is that the algorithm can overshadow the shadows, make the night look like a day, or oversaturate the colors, and in such cases, you'd better switch to HDR Off and take a shot, sacrificing the details in the shadows for the sake of the naturalness of the picture, and also check if you have an "Ultischizer" or filters that may conflict with the processing.

⚠️ Attention: If the icon HDR If it's yellow or flashing, it could mean that the flash is on in auto mode.

In some cases, the problem may lie in a specific firmware update. MIUI quality HDR-pictures dropped, it makes sense to clear the cache of the camera application through the system settings: → Annexes → All applications → Camera. → Clean up → Clear the cache.

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For maximum detail in the landscapes, use a tripod and a timer of 3 seconds, which will eliminate the trembling of hands during the HDR series and make the photo perfectly clear.