HDR -> SDR conversion

These CUDA filters are packaged into DGDecodeNV, which is part of DGDecNV.
alexantr
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Joined: Mon Oct 15, 2018 4:24 pm

Re: HDR -> SDR conversion

Post by alexantr » Mon Oct 15, 2018 5:15 pm

Why DGHDRtoSDR has so strange hue?

1. SDR version: https://i.imgur.com/8ns30OO.jpg
2. HDR to SDR with DGTonemap 1.2: https://i.imgur.com/B2jbxdf.jpg
3. HDR to SDR with DGHDRtoSDR 1.10: https://i.imgur.com/zGFdNzF.jpg

avs with DGTonemap:

Code: Select all

loadplugin("D:\Programs\DG\x64\DGDecodeNV.dll")
loadplugin("D:\Programs\DG\x64\DGTonemap.dll")
loadplugin("D:\Programs\DG\x64\avsresize.dll")
SetFilterMTMode("z_ConvertFormat", MT_MULTI_INSTANCE)
DGSource("e:\encode\Coco.dgi", fulldepth=true)
ConvertBits(10)
z_ConvertFormat(pixel_type="RGBPS", colorspace_op="2020ncl:st2084:2020:l=>rgb:linear:2020:l", dither_type="none")
DGReinhard()
z_ConvertFormat(pixel_type="YV12", colorspace_op="rgb:linear:2020:l=>709:709:709:l", dither_type="ordered")
Crop(0, 276, 0, -276)
Spline36Resize(1920, 804)
prefetch(4)
avs with DGHDRtoSDR:

Code: Select all

loadplugin("D:\Programs\DG\x64\DGDecodeNV.dll")
loadplugin("D:\Programs\DG\x64\DGHDRtoSDR.dll")
DGSource("e:\encode\Coco.dgi", fulldepth=true)
Crop(0, 276, 0, -276)
Spline36Resize(1920, 804)
DGHDRtoSDR()
prefetch(6)
Another video:

1. HDR with madVR: https://i.imgur.com/mTlruX1.jpg
2. HDR to SDR with DGTonemap 1.2: https://i.imgur.com/HArYxUt.jpg
3. HDR to SDR with DGHDRtoSDR 1.10: https://i.imgur.com/GaoQ2Go.jpg

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admin
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Re: HDR -> SDR conversion

Post by admin » Mon Oct 15, 2018 8:22 pm

"strange hue"

Not a really precise formulation but I can look into it if you provide me with an unprocessed source stream sample. I can't do much with JPGs.

alexantr
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Joined: Mon Oct 15, 2018 4:24 pm

Re: HDR -> SDR conversion

Post by alexantr » Tue Oct 16, 2018 1:09 am

Please checkout source file: https://mega.nz/#!GsdHmazY!Vo6zfUcpm31E ... HOZbqerSlA

Resulting file after DGHDRtoSDR: https://mega.nz/#!z0MlgaDR!NJlZg76uyf0B ... hDBMeXAcow

Resulting file after DGTonemap: https://mega.nz/#!T8sRhQIZ!4IvY35zNQnwa ... ZK2QLIf7bw

Every my tested video has same problem. I can see almost similar result only after appending Tweak(hue=10).

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admin
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Re: HDR -> SDR conversion

Post by admin » Tue Oct 16, 2018 12:30 pm

Thanks, I'll look into it.

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Re: HDR -> SDR conversion

Post by admin » Wed Oct 17, 2018 11:13 am

Please try out this version:

http://rationalqm.us/hdr/DGHDRtoSDR_1.11.rar

I added some hue correction for the gamut mapping. We'll never exactly match other solutions. What I am aiming for is reasonable results for most streams and fast processing in CUDA mode.

dennis
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Joined: Mon Mar 26, 2018 6:00 am

Re: HDR -> SDR conversion

Post by dennis » Wed Oct 17, 2018 11:49 am

Image Image Image Image

I see similar problem with the colors. It is probably due to the Hable operator implemented with DGTonemap plugin with its dafaults.
At least, I’ve seen same results with ffmpeg tonemapping filters.
Three of above screens are results of Hable tonemapping. The fourth is from the source UHD .hevc.

Working with 240 frames cut from the source Gladiator 2000 UHD I've encountered two more problems:
  • DGDecNV(), when works, processes 236 frames.

Code: Select all

>avs2yuv64 -depth 10 -raw DGTonemap.avs - | x265-64bit-8bit-2018-10-08 - ...
yuv  [info]: 1920x1080 fps 24000/1001 i420p8 unknown frame count
raw  [info]: output file:
...
x265 [info]: HEVC encoder version 2.8+74-fd517ae68f93
...
x265 [info]: tools:
avisynth 16-bit hack enabled
DGTonemap.avs: 960x1080, YV12, 10-bits, progressive, 24000/1001 fps, 236 frames
encoded 236 frames in 293.53s (0.80 fps), 59210.41 kb/s, Avg QP:16.28
If I use FFMS2() as a source instead I have

Code: Select all

>avs2yuv64 -depth 10 -raw DGTonemapMod.avs - | 
...
DGTonemapMod.avs: 960x1080, YV12, 10-bits, progressive, 24 fps, 240 frames
encoded 240 frames in 314.47s (0.76 fps), 58830.89 kb/s, Avg QP:16.23
  • HDR2SDR plugin doesn't work properly.
It process more than 500 frames and I cancel it. Seems like a program loop.
The result seems as if color channels' frames are overlaid.

Working environment
Window 10 Pro v.1803 Build 17134.345
GeForce GTX 1050 Video driver v.398.82

alexantr
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Joined: Mon Oct 15, 2018 4:24 pm

Re: HDR -> SDR conversion

Post by alexantr » Wed Oct 17, 2018 11:50 am

admin wrote:
Wed Oct 17, 2018 11:13 am
Please try out this version:

http://rationalqm.us/hdr/DGHDRtoSDR_1.11.rar

I added some hue correction for the gamut mapping. We'll never exactly match other solutions. What I am aiming for is reasonable results for most streams and fast processing in CUDA mode.
Awesome! Thanks!
Last edited by alexantr on Wed Oct 17, 2018 12:38 pm, edited 1 time in total.

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admin
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Re: HDR -> SDR conversion

Post by admin » Wed Oct 17, 2018 12:01 pm

@ alexantr

You're welcome, and thank you for your valuable report.

@dennis
dennis wrote:
Wed Oct 17, 2018 11:49 am
Working with 240 frames cut from the source Gladiator 2000 UHD I've encountered two more problems:
DGDecNV(), when works, processes 236 frames.
There may be a good reason for that. If you link me to your cut stream I can look into it.
HDR2SDR plugin doesn't work properly.
I don't know that plugin.

dennis
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Joined: Mon Mar 26, 2018 6:00 am

Re: HDR -> SDR conversion

Post by dennis » Wed Oct 17, 2018 12:44 pm

Tonemapping isn't a trivial task and the operators least at their defaults aren't universal.
I've just found a JOHN HABLE's publication at http://filmicworlds.com/blog/filmic-ton ... er-curves/
proposing Filmic Tonemapping with Piecewise Power Curves.
Here is his source code https://github.com/johnhable/fw-public
I think it would be nice if we had this model implemented as aa AviSynth.

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admin
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Re: HDR -> SDR conversion

Post by admin » Wed Oct 17, 2018 12:48 pm

@dennis

Are you going to ignore my request for your source file, etc.?

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