MadVR HDR and Dolby Vision 4000 Nits PQ Tonemapping Tutorial

madvr hdr tutorial dolby vision

There are some HDR aspects that you must learn before playing a movie on your devices/screens.

HDR is a higher nit grade in the PQ Gamma BT. 2020 space for Blu-Ray and our transfers in UHD VISIONPLUSHDR-X.

There are low nit Max-Fall grades ( 1000 nit PQ HDR ) that most studios decide to do with the goal to avoid difficulties in the tonemapping.

Most HDR10 TV’s tonemapping and compression capabilities are not that good.

Dolby Vision TV’s will tonemap in a higher quality level if the video is flagged with the Dolby Vision package only.

If not DV flagged, it will just playback with HDR10 “features”, in case of a Dolby Vision TV set, it won’t use the Dolby chipset for tonemapping.

Most HDR10 movies use low MaxFall and low peak to avoid HDR10 TV’s to show a wrong tonemap and clipped details with compressed gamut.

Re-Grading HDR involves optimizing the PQ gamma curve for the real HDR potential and effect.

An HDR Re-Grade will enhance the highlight detail and deep blacks but at the same time expanding the range and contrast in a balanced output image.

This creates the feeling of watching a realistic image unlike SDR standard where everything is just linear and limited to the 100 nits gamma curve.

A simple comparison against our HDR-X Advanced HDR10+ Color Transform

against

The Studio UHD Blu-Ray Disc transfer:

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Look up for the details in the black zones ( also contrast on objects ) among all the rest of improvements like color gamut/expression/vibrance, object luminance/shadow casting/reflections.
One nice difference: Bottom right, look up for the POLICE red/cyan letters not much visible on the uhd disc hdr grade.

REMEMBER WE TRANSFER OUT OF BLU-RAY SDR 1080p DISC. THIS ALSO PROVES STUDIOS USE THE 2K/Blu-Ray 1080p Master to transfer to the 2K DI UHD HDR DISC.

 

YOUTUBE HDR Enabled Sample:

 

Only downside when watching high nit processed images is that you need a panel with such nits to fully enjoy it. Or you will feel it dark.
MadVR has a first option in the HDR functions called “Let Decide”, this option basically do a 200 nit compressed highlights tonemap.

For 4000 nit grades, MadVR HDR to SDR in high nit processing is always recommended.

Never use VLC 3.0 or any other such Windows 10 HDR Movies & TV player, as those are meant for 1000 nit HDR grades.

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