What does HDR mean in the lens?

Distance (HDR), compared with ordinary images, can provide more dynamic range and image details. According to the LDR (low dynamic) of different exposure time,

Distance) image, and a final HDR image is synthesized by using an LDR image with the best details corresponding to each exposure time.

, can better reflect the visual effect in the real environment.

HDRI is full of energy.

range

The abbreviation of (HDR) image, that is, high dynamic range image, was invented to solve this problem. Simply put, HDRI is an image with a very wide brightness range, which has more brightness data storage than other images, and its way of recording brightness is also different from traditional pictures. Instead of compressing the brightness information into 8bit or 16bit color space in a nonlinear way, it records the brightness information in a directly corresponding way. Many HDRI files are provided in the form of panorama, and we can also use it as the environmental background to produce reflection and refraction. It should be emphasized here that HDRI is fundamentally different from panorama. Panorama refers to an ordinary image containing a 360-degree scene, which can be in JPG format, BMP format, TGA format, etc. , which belongs to low dynamics.

Range radiation

Image, it has no lighting information.

HdrI file is a file with an extension of HDR or tif format, which has enough ability to save lighting information, but it is not necessarily a panorama. dynamic

Range refers to the relative ratio between the brightest and darkest parts of the scene. An HDR picture records the brightness value of the actual scene far exceeding 256 levels, and the excess part cannot be displayed on the screen. You can imagine: in photoshop, open a picture taken indoors and out of the window. The part outside the window is overexposed in the strong sunlight, showing a piece of white without too many details. Nothing you can do can stop it. Dimming will only turn white into gray without showing more details. But if you record the same scene with hdr, if you reduce the exposure, the original pure white part will show more details. When it comes to game screens, what exactly is HDR? HDR itself is full of energy.

The abbreviation of Range (high dynamic range) was originally a CG concept.