Introduction - If you have any usage issues, please Google them yourself
The dynamic range of an image generally refers to the ratio of the maximum and minimum brightness. The human eye is a very high resolution of the object, and it luminance dynamic range of up to 1 billion: 1, and the scope of the general imaging apparatus than the human eye can see much smaller, less than the dynamic range of the human eye brightness thousand million. If you want to display on the device can be as close as possible to the human eye, showing more information, hence the need for dynamic range compression.