HDR is a popular term in mobile phones, TVs, and video recording equipment in recent years. The Mavic 2 Pro released earlier by DJI also supports 4K HDR video recording. However, there are several formats of HDR, and there are different LOGs for recording, which makes people confused. Dronesplayer specially interviewed experts to provide answers for everyone. HDR four formats HDR (High Dynamic Range, high dynamic range) refers to photos or videos that have high latitude characteristics, high light and dark positions can still show details, rather than a whole white or black. There are several HDR standards, including HLG, HDR10, HDR10+ and Dolby Vision. The 4K HDR used by DJI Mavic 2 Pro is the HLG system. HDR display can show the original appearance of real image better than traditional display. Both HDR10 and Dolby Vision are used for filming, professional shooting, etc. Both have metadata, but HDR10 uses static metadata, while Dolby Vision is dynamic metadata; that is, the HDR10 picture will be fixed High dynamic bracketing, and dynamic metadata, that is, the HDR effect will be adjusted according to the changes of each frame. As for HDR10+, it is based on the new specifications of HDR10. It also emphasizes dynamic metadata. Each screen can be optimized independently. It is in line with Dolby Vision. It is conceivable that the hardware requirements are also quite high. HDR can show more details in bright and dark parts. HLG is more suitable for general users As for the 4K HDR shooting system used by Mavic 2 Pro, the full name of HLG is Hybrid-log Gamma. It has no metadata and is backward compatible with the traditional SDR (Standard Dynamic Range) standard. The color bit rate is the same as HDR10 and HDR10+. The same is 10-bit (12-bit for Dolby Vision), which is more suitable for general users than other standards. John Chan, editor of Spill HK, said that HLG can take into account the same effect of frequency bandwidth and is suitable for general users. According to John Chan, editor of the audio-visual website Spill HK, HLG is specially designed for TV broadcasting and has a high compression rate. Because it requires less bandwidth, it is convenient for HDR video broadcast by atmospheric waves. He believes that DJI Mavic 2 Pro's 4K HDR recording using HLG format is a correct choice, because Sony A7 also uses HLG format for HDR shooting. HLG can take into account the same bandwidth effect, and most HDR TVs support playback. . Log is designed to save space As for the Dlog-M supported by Mavic 2 Pro, John said that each manufacturer has its own Log Profile. For example, Sony has S-Log, Canon has C-Log, Nikon has N-Log, etc., which are basically ultra-low contrast. The picture characteristics of the, retain the most details and post-production space, which is convenient for the film to be graded. John said that although the RAW format has the most information and the quality is naturally the best, it has a large capacity. In contrast, the Log file has a much smaller volume and is more convenient to store. If you compare it to a photo, Log is like a low-contrast JPEG file, which is small in size and has a large space for post-production. 10-bit Dlog-M shooting can record more color information. 10-bit shooting can avoid insufficient color gradation We also interviewed Yue Zhizhong (Sam), an aerial photographer with considerable post-production experience. He said that the 10-bit Dlog-M attracts 1 billion colors, which is much higher than the 8-bit 16 million colors. Therefore, in the post-grading, the color space is greatly improved. For example, when the saturation of the sky is adjusted by post-retouching, there are often cases of layering due to insufficient color gradation, such as the use of 10-bit Dlog- M shooting, this problem will not occur. Dlog-M requires post-production toning, but HDR shooting does not. However, Sam believes that for the average user, there is no post-production dimming and color adjustment ability. 10-bit DLog-M is not very useful. You can use HDR to shoot directly to increase the details of the high dynamic range. As for the Mavic 2 Pro HDR recording function using the HLG format, Sam believes that there is a larger dynamic range in highlights, because it does not have metadata like HDR-10, the display quality will vary depending on the brightness of the display. Since HLG is a format that combines SDR and HDR image information in the same signal, it is also licensed for free and is suitable for broadcast programs, which is a compromise choice. Aerial photographer Yue Zhizhong said that 10-bit DLog-M shooting can greatly increase the color palette. Single Arm Type Pole,Single Arm Type Street Pole,Single Arm Type Light Pole YIXING FUTAO METAL STRUCTURAL UNIT CO.,LTD( YIXING HONGSHENGYUAN ELECTRIC POWER FACILITIES CO.,LTD.) , https://www.chinasteelpole.com
Yixing Futao Metal Structural Unit Co. Ltd. is com manded of Jiangsu Futao Group.
It is located in the beach of scenic and rich Taihu Yixing with good transport service.
The company is well equipped with advanced manufacturing facilities.
We own a large-sized numerical control hydraulic pressure folding machine with once folding length 16,000mm and the thickness 2-25mm.
We also equipped with a series of numerical control conveyor systems of flattening, cutting, folding and auto-welding, we could manufacture all kinds of steel poles and steel towers.
Our main products: high & medium mast lighting, road lighting, power poles, sight lamps, courtyard lamps, lawn lamps, traffic signal poles, monitor poles, microwave communication poles, etc. Our manufacturing process has been ISO9001 certified and we were honored with the title of the AAA grade certificate of goodwill.
Presently 95% of our products are far exported to Europe, America, Middle East, and Southeast Asia, and have enjoyed great reputation from our customers.
So we know the demand of different countries and different customers.
We are greatly honored to invite you to visit our factory and cheerfully look forward to cooperating with you.