People may not be unfamiliar with the word HDR, but most people have only heard of it. They don't have too many concepts in their minds. They may simply think that HDR is to make photos look better, which is true. But what's good about turning on HDR? What's the difference between turning on HDR and not turning on HDR? When should we turn on HDR?

HDR is a commonly used technology in photography. It is the abbreviation of High Dynamic Range, which means "high dynamic range". HDR technology can overcome the disadvantage of limited dynamic range of most camera sensors, and control the image tone within the range of human eye recognition. It can superimpose multiple photos with different exposures into an exquisite image.

HDR simply means to make your photos clear in both highlights and shadows. Another explanation of white points is that when you shoot a work with a large light ratio, you reduce the light ratio to create a kind of high light but not exposed, and dark tone is not underexposed. Make the bright part bright, while the dark part retains more details, and can distinguish the contour and depth of the object, instead of the previous black mass. For example, if we take a picture with a very bright sky, the result is either that the sky is over exposed or that the ground is under exposed.

The landscape on the surface of non HDR photos is black

HDR photos retain details of the sky and ground

In the past, HDR photography enthusiasts would use software to combine multiple photos taken by SLR into one HDR image. But with the improvement of mobile phone performance, now we can also directly take multiple photos with different exposures on the mobile phone to achieve HDR. Compared with our common iPhone, when we turn on the HDR function, the iPhone will take three consecutive photos. The exposure of these three photos will be different, namely, under exposure, normal exposure, and overexposure. Then the three photos will be combined into one. After HDR synthesis, you can improve the detail performance of dark and light parts of photos.

In the following picture, the left picture is HDR picture, and the right picture is non HDR picture. It is obvious that the non HDR picture is obviously overexposed on the roof and lacks details.

But it doesn't mean that HDR is always very effective. If your light is good enough (such as the scattered light on the front), and there are no fine highlights in the picture, then the result of "HDR" will be: the picture color will fade, there will be no more details to speak of, and the overall sense of hierarchy of the picture will decline, so HDR can't be opened casually, depending on the situation.

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