The formats of ITU-R BT.2100 HLG and ITU-R BT.709 video in use by TV broadcasters are known as "narrow-range" formats. We have used the ITU terminology in this blog post. It should be noted that there is a difference in terminology between the EBU and the International Telecommunication Union (ITU) where what is termed "file-full" by the EBU is called "full-range" by the ITU. It also depicts in grey the "file-full" and "SDI-full" ranges in use elsewhere. This figure from the European Broadcasting Union (EBU) document on video ranges shows the "narrow-range" video levels in use by broadcasters. LUTs are available which cover a number of code value ranges. For a fuller reference, please see the LUT release notes, implementation guidelines and production guidelines. This blog post summarises the variants and aims to help you decide which is the best for your needs. However, due to the variety of SDR camera implementations, and the wide range of LUT capabilities, there are several LUT variants in the BBC R&D pack. Test LUTs to verify the correct operation of LUT hardware. Sony S-Log3 and S-Log3 SR Live (BT.2020 colour) to BT.2100 HLG, thereby matching the colour and "look" of BT.2100 HLG cameras.BT.2100 HLG to BT.709 (SDR) "down-mapping" to match the colour and "look" of downstream SDR cameras.BT.709 (SDR) to BT.2100 HLG "up-mapping", for colour-matching SDR and HLG cameras but with a small highlights "boost" to complement the visual characteristics of HDR cameras.BT.709 (SDR) to BT.2100 HLG "direct-mapping", for colour-matching SDR and HLG cameras.Scene-light conversions, which should be used for colour-matching cameras in live production: BT.2100 HLG to PQ 110 cd/m 2 nominal peak-luminance X'Y'Z' (HDR movie).BT.2100 HLG to PQ P3D65 1000 cd/m 2 nominal peak-luminance.PQ P3D65 1000 cd/m 2 nominal peak-luminance to BT.2100 HLG.BT.2100 HLG to BT.709 "down-mapping", preserving the "look" of the HDR content (colour, low-lights and mid-tones) as it is converted to SDR.BT.709 (SDR) to BT.2100 HLG "up-mapping", slightly increasing the contrast in the SDR image to better match the appearance of "native" HDR content.BT.709 (Standard Dynamic Range (SDR)) to BT.2100 HLG "direct-mapping", preserving the appearance of SDR.BT.2100 HLG to BT.2100 PQ 1000 cd/m 2 nominal peak-luminance.BT.2100 PQ 4000 cd/m 2 nominal peak-luminance signals to BT.2100 HLG.BT.2100 Perceptual Quantization (PQ) 1000 cd/m 2 nominal peak-luminance signals to BT.2100 Hybrid Log-Gamma (HLG).Display-light conversions, which preserve the colour and appearance of content after conversion:
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