HDR to SDR Conversion LUTs v1.1
HDR to SDR Conversion LUTs v1.1
New in Version 1.1:
Added HLG to SDR and P3D65 PQ to SDR conversion LUTs, using the same color science as the HDR10 to SDR LUTs
Added an HDR10 to SDR reversible LUT, with corresponding SDR to HDR10 transformation
Renamed pack to HDR to SDR Conversion LUTs to correspond with updated content
The MBOX HDR10 to SDR Conversion LUTs are quick transformation LUTs to move HDR content into the SDR space. These LUTs are suitable for use as mastering LUTs, and do not require additional color correction to maintain color fidelity.
There are twenty-two LUTs in this pack:
MBOX HDR10 to Rec. 709 SDR Direct Conversion
MBOX HDR10 to P3 D65 SDR Direct Conversion
MBOX HDR10 to Rec. 2020 SDR Direct Conversion
MBOX HDR10 to Rec. 709 SDR Direct Conversion with Intensity Matching
MBOX HDR10 to P3 D65 SDR Direct Conversion with Intensity Matching
MBOX HDR10 to Rec. 2020 SDR Direct Conversion with Intensity Matching
MBOX HDR10 VFX Monitoring LUT for sRGB Direct Conversion
MBOX HDR10 VFX Monitoring LUT for sRGB Direct Conversion with Intensity Matching
MBOX HDR10 to SDR REV EOTF Only-Clamped (Reversible)
MBOX SDR to HDR10 REV EOTF Only-Clamped (Reversible)
MBOX HLG HDR (P3 D65) to SDR (P3 D65)
MBOX HLG HDR (P3 D65) to SDR (Rec 709)
MBOX HLG HDR (P3 D65) to SDR (Rec 2020)
MBOX HLG HDR (Rec 709 )to SDR (Rec 2020)
MBOX HLG HDR (Rec 709) to SDR (P3 D65)
MBOX HLG HDR (Rec 709) to SDR (Rec 709)
MBOX HLG HDR (Rec 2020) to SDR (P3 D65)
MBOX HLG HDR (Rec 2020) to SDR (Rec 709)
MBOX HLG HDR (Rec 2020) to SDR (Rec 2020)
MBOX P3 D65 PQ HDR to SDR Direct Conversion (P3 D65)
MBOX P3 D65 PQ HDR to SDR Direct Conversion (Rec 709)
MBOX P3 D65 PQ HDR to SDR Direct Conversion (Rec 2020)
Each of the first eight LUTs assume an HDR10 compliant source, that is, Rec. 2020 color primaries with a SMPTE ST.2084 (PQ) EOTF.
The HDR10 to SDR LUTs use two slightly different techniques to convert HDR10 into three different color spaces (labeled P3 D65, Rec 709, and Rec 2020, respectively) and into sRGB for monitoring VFX on desktop displays.
The Direct Conversion LUTs seek to maintain contrast through the mids and the darks, and to roll off the highlights into SDR peak. Then, the resulting SDR image is converted into the target color space.
The Intensity Matching LUTs build on the direct conversion LUTs by adding increased vibrance to the image to better emulate the vibrant look of the HDR image.
The two LUTs labeled VFX monitoring LUTs are for working in HDR VFX timelines, while seeking to see what you're doing on SDR interface displays. We recommend using these as non-rendering monitoring LUTs.
The HDR10 to SDR reversible LUTs are for applications where HDR content needs to be mapped to SDR, and then the SDR needs to be remapped into HDR. Applying both LUTs in sequence should result in zero change in the image.
Unlike the SDR to HDR LUTs, which we provide here, the SDR to HDR10 reversible LUT a) only works on the transfer function and does not alter color primaries, and b) expands the highlights into HDR space, reversing the compression added by the HDR10 to SDR reversible LUT. As such, it is not suitable for converting SDR graded content to HDR: the results are unpredictable.
The HLG to SDR LUTs allow for moving from Hybrid Log Gamma encoded with Rec. 2020, P3 D65, or Rec. 709 color primaries into Rec 2020, P3 D65, or Rec. 709 SDR. While HLG is technically partially compatible with SDR displays, these LUTs keep a higher mid tone and have a heavier compression on the highlights than the HLG curve, giving a more natural SDR image.
The P3 D65 LUTs are provided as direct conversion LUTs to move from P3 D65 PQ sources, such as Dolby Vision Masters, into SDR. No intensity matching LUTs are provided.
For a demonstration of how the LUTs work and the problems they solve, visit our blog post here.
These LUTs are licensed for use in a post-production setting for applying to assets prior to the assets distribution. If you are interested in incorporating these LUTs into HDR encoding, distribution, or exhibition technology, please contact us for more information on licensing.