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High Dynamic Range Imaging, referred to as HDRI or HDR is used in projectors and film photography to achieve a larger exposure dynamic range. Dynamic Range was originally not a concept in the field of photography, but a characterization parameter of signal science. When this concept is extended to the field of photography, it is usually used to characterize the brightest and darkest range in a picture:
What is dynamic range?
The so-called "dynamic range" is to display the bright range, so if you want to increase the "dynamic range" and display it, the most critical point is to be able to achieve higher brightness.
As shown in the above picture, in a real natural environment, the contrast of brightness in a scene may be very large. For example, the center petal of the sun shining part can be as bright as 10,000 nits, while the background brightness is only 100 nits. In photography technology, high dynamic range is HDR technology. This technology is mainly to solve the problem of shooting with large light ratio. In the process of shooting practice, we will find that for general sunrise and sunset shooting, due to backlighting and the light ratio is too large , It is easy to shoot the sky too bright or the ground too dark.
This concept is relatively easy to understand, that is, the dynamic range value is high, and the picture can display wider and richer brightness information: in the era of digital photography, HDR has gradually become synonymous with a post-technique, not only cameras, but many mobile phones now also support HDR Real-time and post-processing: Any photography technique has its scope of application. Proper use can produce good results, but blind and excessive use will be counterproductive and make the picture look messy
What is dynamic range?
The so-called "dynamic range" is to display the bright range, so if you want to increase the "dynamic range" and display it, the most critical point is to be able to achieve higher brightness.
As shown in the above picture, in a real natural environment, the contrast of brightness in a scene may be very large. For example, the center petal of the sun shining part can be as bright as 10,000 nits, while the background brightness is only 100 nits. In photography technology, high dynamic range is HDR technology. This technology is mainly to solve the problem of shooting with large light ratio. In the process of shooting practice, we will find that for general sunrise and sunset shooting, due to backlighting and the light ratio is too large , It is easy to shoot the sky too bright or the ground too dark.
