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

2, hlg: the full name of hlg is Hybrid Log Gamma, which is a standard of high dynamic range HDR jointly developed by British BBC and Japanese NHK TV. HLG does not need metadata, and it is backward compatible with SDR. Compared with HDR1, its picture can be more beautiful and moving even on the existing SDR display device.

3. hdr1: hdr1. On August 27th, 215, the media file of HDR 1, commonly known as HDR 1, was published by the Consumer Electronics Association of America. It uses the recommended 22 color space, Perceptual Quantizer(PQ) and bit depth of 1 bits. Hdr1 is supported by various companies.

Extended information

The best partner of HDR: OLED TV

1. The image quality improvement brought by HDR technology is intuitive and can be recognized by the naked eye, so many manufacturers have installed HDR technology on TV products this year.

2, but even so, not all TV products can be a "good match" for HDR technology. After all, the application of HDR technology is not a single link, but related to the entire ecosystem of screen display.

3. A perfect HDR requires two conditions, the first is high contrast, and the second is excellent color expression. However, OLED TV is different from the traditional liquid crystal display technology. It abandons the backlight and realizes the organic self-luminescence of each pixel, which means that each pixel can be turned on or off independently, and it has the advantages of infinite contrast, wide color gamut and wide viewing angle. Therefore, HDR can be fully used in OLED TV.

4. First of all, the most important thing for HDR is contrast. The lowest brightness that LCD TV can display is .1nits, and the brightest brightness is between 5 and 1nits, and the contrast ratio is only 5 to 1.

5, if the brightness is doubled to 1nits, it can only reach 1 to 1. The lowest brightness that LG OLED can display is .5nits (the lowest brightness that can be detected by brightness measuring instruments at present), and the highest brightness is 5nits, which is about 2 grades. The contrast ratio is 1 million to 1, and the lowest brightness (.5nit) is almost zero. So it is equivalent to having a contrast close to infinity.