What does NDR mean in mobile phone photography?

I don't think there's this! HDR only

Hello! Let's first understand what HDR is, HDR stands for (High-Dynamic Range) and is a set of technologies used to achieve a larger** dynamic range than ordinary digital imaging technology. Dynamic range refers to the ratio of the maximum value to the minimum value of the signal that an image or imaging device can represent.

The purpose of high dynamic range imaging is to correctly represent the brightness of a wide range of real-world luminance, from direct sunlight to the darkest shadows. As early as more than 100 years ago, the pioneers of photography combined several films of the same scene and different degrees to achieve a high dynamic range effect and balance the light and dark areas in the **.

To put it simply, HDR can be used to show images that are outside of its brightness range, and HDR can greatly improve the contrast between light and dark in picture details. Specifically, smartphones and digital cameras take multiple shots and compose them in software to improve the overly bright or dim parts of the camera to achieve a more balanced effect.

HDR is mainly made up of two parts, dynamic control and halo effect. Let's start with dynamic control, where a typical display is capable of displaying pixel values between the r, g, and b components of [0,255]. And 256 different brightness levels are obviously not indicative of the brightness of light in nature.

The most obvious example is that the sun is thousands of times brighter than an incandescent lamp or tens of thousands of times brighter than an indoor light illuminated by diffuse reflection, which is beyond the maximum value that can be displayed by the brightness of a display, and the problem that HDR technology aims to solve is to represent a wide range of brightness within a limited range of brightness. The principle is similar to that of a camera, where the brightness of the light is adjusted by an algorithm to map the light from high dynamic range to low dynamic range, resulting in a convincing lighting effect.

The halo effect refers to the fact that when a person walks from a dark place to a bright place, the pupils will not have time to contract, and the eyes will squint on their own to protect the photoreceptor cells on the retina. HDR mimics this physiological response of the human eye to automatically adapt to changes in light by making adjustments to the original image, producing an effect similar to a halo.

**After HDR processing, the original brightness is insufficient, or the original darkness can show the contour and depth of the original object. And not pitch black.

In general, HDR is a photographic technique that expands the dynamic range by compositing multiple images in post, which allows the darker and lighter parts of the same image to retain richer contours and details. For example, when shooting a ** that includes both an indoor scene and a sky, you may want to preserve both the details of the indoor light and the brighter details of the sky.

Refer to "Weifeng.com".

I hope my answer is helpful to you and I wish you a happy life!

No, the full name of HDR is High

dynamic

Range, or High Dynamic Range, such as the so-called High Dynamic Range Image (HDRI) or High Dynamic Range Rendering.

HDR is the latest and most advanced means of pursuing picture realism. HDR seems to be a high-end term, in fact, it simply means that after using HDR technology, the bright places will be brighter, and the dark places will be darker, so that the details between light and dark will be more obvious. In fact, in everyone's daily use, the effect of HDR photography is not very obvious, because the details of the object are very clear in a sunny environment, so the characteristics of HDR are difficult to show.

But in the case of backlight or dim light, the role of HDR is very obvious, and the original chaotic picture is suddenly a lot clearer A HDR**, which records the brightness value of the actual scene far beyond 256 levels, and the excess part cannot be displayed on the screen. You can imagine this: open a photograph from the inside to the window in photoshop, the part outside the window is in strong sunlight, **excessive, showing a piece of white, without much detail.

There's nothing you can do about it, dimming it will just turn white into gray and won't show more detail. But if the same scene is recorded by HDR, if you reduce the ** degree, the original pure white part will show more detail.

HDR in mobile phone camera is the abbreviation of English High-Dynamic Range, which means "High Dynamic Range".

To put it simply, it is to make your ** both highlights and shadows very clear. It can get strong light and the scenery is not exposed, and the shadows are not underexposed.

HDR is a technique commonly used in photography, which is the abbreviation of English High-Dynamic Range, which means "High Dynamic Range". HDR technology can overcome the shortcomings of the limited dynamic range of most camera sensors, and control the ** color tone within the recognition range of the human eye. It can superimpose multiple **different** images into one stunning image.

HDR simply means to make your ** both highlights and shadows very clear. To put it more clearly, when you shoot a work with a relatively large light ratio, reduce the light ratio to create a kind of highlight that is not too exposed, and the dark tone is not underexposed. Let the effect of the light be bright, and the darkness retains more detail, so you can distinguish the outline and depth of the object, rather than the usual black.

That is, for example, if we shoot a picture of the sky is very bright, under normal circumstances, the result of the shooting is either that the sky is too explosive, or the scenery on the ground is insufficient.

Non-HDR** The surface of the ground is dark.

HDR** Detail has been preserved both in the sky and on the ground.

In the past, HDR photography enthusiasts would combine multiple photos taken by SLR into one HDR through software. But with the improvement of mobile phone performance, now we can also directly achieve HDR by shooting multiple **different** photos directly on the mobile phone. Compared with our common iPhone, when we turn on the HDR function, the iPhone will take 3 shots in a row**, and the situation of these three ** will be different, which are under-explosion, normal** and over-exposure, and then these three ** will be combined into one.

After HDR synthesis, the details of the dark and bright parts can be improved.

The following picture**, the left picture is HDR**, the right picture is non-HDR, it can be clearly seen that the non-HDR** is obviously excessive in the roof part and lacks details.

But it's not that HDR will always be very effective, if your light is good enough (such as the light that is staggered on the front), and there are no fine highlights in the picture, then the result of HDR will be: the color of the picture is lighter, there is no more detail to speak of, **The overall sense of hierarchy is reduced, so HDR can't be turned on casually, it depends on the situation.

When you are taking pictures, I don't know if you have noticed the HDR mode in the camera, and some mobile phones may call it backlight mode. How much do you know about it? Any idea how it works?

What does HDR mean in mobile phone photography?

It is to automatically take a lot of photos when taking pictures, and then automatically synthesize one to make ** look brighter and more colorful.

HDR stands for High Dynamic Range. It's a simple term, HDR is the use of multiple different sheets, and then using software to combine them into one. The advantage is that you end up with a picture that has detail in both the shadows and the highlights.

In normal photography, you may have to choose one of the two.

High dynamic range image (High-Dynamic Range, referred to as HDR), compared with ordinary images, can provide more dynamic range and image details, according to different time LDR (Low-dynamic Range) images, the use of each time corresponding to the best details of the LDR image to synthesize the final HDR image, can better reflect the visual effect in the real environment.

1. HDRI is the abbreviation of High-Dynamic Range Image, that is, high dynamic range image, which was invented to solve this problem, simply put, HDRI is an image with a very wide range of brightness.

2. It has a larger brightness data storage than other formats of images, and it records brightness in a different way than the traditional one, not in a nonlinear way to compress the brightness information into 8bit or 16bit color space, but in a direct correspondence to record the brightness information.

3. Here it is emphasized that HDRI has an essential difference from panorama, which refers to an ordinary image that contains a 360-degree range of scenes, which can be JPG format, BMP format, TGA format, etc., which belongs to low-dynamic rangeradiance image, which does not carry lighting information.

A camera, abbreviated as a camera, is a device that uses the principle of optical imaging to form an image and record it with a negative. Many devices that can record images have the characteristics of a camera. Medical imaging equipment, astronomical observation equipment, etc.

A camera is an optical device used for photography. After the light reflected by the subject is focused through the photographic lens (camera objective) and the shutter that controls the amount of **, the subject forms a latent image on the photosensitive material in the camera obscura, and then processes (i.e., developing, fixing) to form a permanent image, which is called photography.

A digital camera is a type of camera that uses an electronic sensor to convert optical images into electronic data. Unlike a normal camera, which relies on the chemical changes in silver bromide on film to record images.

What does HDR mean in mobile phone photography?

The tolerance of the mobile phone camera is not good, in the case of a slightly larger light ratio, the bright places are too bright, and the dark places are dark and can't be seen clearly. HDR mode is to use two different **parameters to instantly take two ** for synthesis, so that ** get a better effect, pure hand play, adopt it.

High-Dynamic Range (HDR).

When shooting in environments with large light ratios, ordinary cameras are limited by dynamic range and cannot record extremely bright or dark details. Processed by the HDR program**, even in the case of large light ratio shooting, no matter the highlights, dark positions can obtain better levels than the ordinary**.

HDR stands for High-Dynamic Range, abbreviated as HDR, which means High Dynamic Range Image.

Compared with ordinary images, it can provide more dynamic range and image details, according to the LDR (Low-dynamic Range) image of different times, the LDR image corresponding to the best detail of each time is used to synthesize the final HDR image, which can better reflect the visual effect in the real environment.

When taking a photo, the iPhone will actually take three shots in a row**, corresponding to underexposure, normal** and overexposure, and then combine them into one**, improving the detail performance of the dark and bright parts.

In most cases, HDR** is closer to what the human eye sees, but when taking photos after HDR is turned on, storage** needs to wait a few more seconds to synthesize HDR, and it may be affected to capture continuously or something; While the iPhone can be set up to save both the original and HDR versions on your phone**, it may take up more storage space.

High dynamic range imaging.

English: High Dynamic Range Imaging (HDRI or HDR), in computer graphics.

and cinematography.

, is a set of technologies used to achieve a greater dynamic range (i.e., greater difference between light and dark) than ordinary digital imaging techniques. The purpose of high dynamic range imaging is to correctly represent the real world from sunlight.

Shine directly into such a wide range of brightness as the darkest shadows.

Extended Information

iPhone Photo HDR Tips:

Landscape Photos: One of the classic applications of the HDR function is the landscape photos under the blue sky and white clouds. Turning on HDR can make the sky bluer and the grass greener, but the only exceptions are sunrise and sunset.

Outdoor portraits: When shooting outdoor backlit portraits, first select the focus point on the subject's face, and then use the HDR function to shoot at the right level for both the subject and the background.

Photograph moving objects: In HDR mode, the iPhone will take three shots** in a row and compose them. Although the continuous shooting speed is fast, if the subject is in motion, the composite ** will still have ghosting.