Simple photography teaching, what is HDR, its principle and application.

The full name of HDR is High-Dynamic Range (HDR) image, which can provide more dynamic range and image details than ordinary images. According to the LDR (Low Dynamic Range) images with different exposure times, the final HDR image is synthesized by using the LDR image with the best details corresponding to each exposure time [1], which can better reflect the visual effect in the real environment.

Simply put, it is to take several different photos of exposure value in the same scene at a time, and then put them together to synthesize a photo.

Application: take a group photo in the window, the backlight of the person is dark and the window is very bright. At this time, shooting with HDR function can balance the light ratio between people and background and make the photos look comfortable.