Hdr > sdr

[Anakin]

Hello

I have a film that is 4K in HDR. When I open it in any program, it’s just green and pink. I want to convert this film to SDR at 1080 to burn to Blu Ray. I’ve tried a few different things, but it seems really dark and faded. Is there any way to do this but keep the colour and brightness?

Thanks

Ani

[davexnet]

I'm not 100% sure, but the conversion of Dolby Vision type HDR to SDR is not yet possible.

Search the forum and look at some of the earlier threads

[Selur]

If it's Dolby Vision Version 1.0 dvhe0509 one could use the LUT from https://forum.doom9.org/showthread.php?p=1964642#post1964642
Also there's:

• https://github.com/Asd-g/avslibplacebo for Avisynth
• https://github.com/Lypheo/vs-placebo/ for Vapoursynth

where the ToneMap function supports using dovi.
Note that you can't have the full HDR experience as the you are mapping to SDR which is just a more limited.
Here's an example using Vapoursynt:

clip = core.placebo.Tonemap(clip=clip, src_csp=3, dst_csp=0)

Cu Selur

[Anakin]

Hey guys,

Found a solution. If you use Handbrake to convert and use the BT709 colourspace, it will convert in all its glorious colour, and not the washed out look.

[davexnet]

Hey guys,

Found a solution. If you use Handbrake to convert and use the BT709 colourspace, it will convert in all its glorious colour, and not the washed out look.

Thanks for mentioning this, I remember it doing this with regular HDR and I was surprised - automatic
and inferred tone mapping.
I then promptly forgot about it until your post

[Cornucopia]

Just understand that "automatic & inferred tonemapping" CANNOT be optimal, or even desirable to most people, as it cannot take into account the system, the environment, the audience sensitivities and tastes, nor the content and the intent of its mood. I would also strongly question "inferred" - from What? How?


Scott

[Anakin]

Just understand that "automatic & inferred tonemapping" CANNOT be optimal, or even desirable to most people, as it cannot take into account the system, the environment, the audience sensitivities and tastes, nor the content and the intent of its mood. I would also strongly question "inferred" - from What? How?


Scott

I have no idea what you just said!

[Cornucopia]

https://en.wikipedia.org/wiki/Tone_mapping#:~:text=Tone%20mapping%20is%20a%20technique...namic%20range.

There are a multitude of ways to tone map. Not all are appropriate (most are not). Do you know what Handbrake says it's doing?

[davexnet]

I haven't seen the log, I don't know if it's using the method we used in Avisynth using DGReinhold
or not, but the conversion I did looked similar to some tests l'd done
using the other method
Seems like automatic tone mapping based on the source, output file color space

EDIT Handbrake log shows this:

+ Colorspace (primaries=bt709:transfer=bt709:matrix=bt709:tonemap=hable:desat=0)

When you select the BT.709 color space in the filters tab, the preview screen is updated to show the new colors -
Seems to work well

[ricardouk]

Have you tried Shutterencoder?

[Anakin]

Have you tried Shutterencoder?

Is that for Windows?

[usually_quiet]

Just click ricardouk's link and take a look at Shutterencoder's page in VideoHelp's software section. It contains download links for Windows (conventional installation and portable), macOS, and Linux.