(2018-04-28, 03:52)DJ_Izumi Wrote:I just tried Leia A1 on Windows yesterday. It seems there is some non defeatable tone mapping built into Kodi. With a 3DLUT you are essentially applying tone mapping twice.(2018-04-27, 22:03)Soli Wrote: I love you devs. Since Kodi 18 supports BT.2020 (and I presume, use the BT.2020 yuv2rgb coefficients), it's a simple matter of using the built-in 3DLut feature to properly convert to SDR. (At least for Linux, don't know if it's implemented properly for Windows yet).I was gonna say, I was trying these LUTs last night and while the made improvements, human skin tones could only be described as 'supremely orange'.
It's not just about tone mapping (which will vary depending on what how many nits the SDR display is set to, also it's useless to tonemap 10000nits, since all current movies have a MaxCLL value between 1000 and 4000 nits), it's also needs gamut mapping (which again should actually not target the bt.2020 color space but D65/DCI-P3 inside a BT.2020 container), and black point and gamma compensation (if you use your display at say 2.2, 2.3 or 2.4 gamma). You need to use a 3DLut, you cannot fake this. I realize including a lot of big 3DLUT files is not very practical. The best would to mimic a proper on-the-fly conversion like madVR is able to, and use the 3DLUT for the ones that require the absolute best quality)
Here's a few 3DLuts you could try. These should work beautifully. Just use the one that looks best for your display. They target a gamma of 2.2.
https://mega.nz/#!5uQAEC5Y!_sfHlVBKsNs1t...j7zqEFFCKE
EDIT: have to take back some of things I wrote. It seems at least the Windows version applies some automatic color management when playing (some or all) HDR files.
(2018-04-28, 11:50)Soli Wrote:Yeah I kinda wonder. Kodi on Windows at least seems to do SOME fix on HDR video on my HTPC, it's not 'right' but it's def not 'super pale' like it was six months ago. And with the LUT applied it goes right to 'Crazy Orange' on skin tones at the least. So a 'doubling up' seems plausible.(2018-04-28, 03:52)DJ_Izumi Wrote:I just tried Leia A1 on Windows yesterday. It seems there is some non defeatable tone mapping built into Kodi. With a 3DLUT you are essentially applying tone mapping twice.(2018-04-27, 22:03)Soli Wrote: I love you devs. Since Kodi 18 supports BT.2020 (and I presume, use the BT.2020 yuv2rgb coefficients), it's a simple matter of using the built-in 3DLut feature to properly convert to SDR. (At least for Linux, don't know if it's implemented properly for Windows yet).I was gonna say, I was trying these LUTs last night and while the made improvements, human skin tones could only be described as 'supremely orange'.
It's not just about tone mapping (which will vary depending on what how many nits the SDR display is set to, also it's useless to tonemap 10000nits, since all current movies have a MaxCLL value between 1000 and 4000 nits), it's also needs gamut mapping (which again should actually not target the bt.2020 color space but D65/DCI-P3 inside a BT.2020 container), and black point and gamma compensation (if you use your display at say 2.2, 2.3 or 2.4 gamma). You need to use a 3DLut, you cannot fake this. I realize including a lot of big 3DLUT files is not very practical. The best would to mimic a proper on-the-fly conversion like madVR is able to, and use the 3DLUT for the ones that require the absolute best quality)
Here's a few 3DLuts you could try. These should work beautifully. Just use the one that looks best for your display. They target a gamma of 2.2.
https://mega.nz/#!5uQAEC5Y!_sfHlVBKsNs1t...j7zqEFFCKE
EDIT: have to take back some of things I wrote. It seems at least the Windows version applies some automatic color management when playing (some or all) HDR files.
(2018-04-29, 03:32)Soli Wrote: That said, it seems that Kodi does have a NON defeatable HDR->SDR tonemapping (In my books, is a big no-no). But it seems it's only limited to tonemapping and does not do full/proper color management.I didn't look extensively through Kodi codes, but it looks like your assumption is correct. I couldn't find anything related to BT.2020 to BT.709 gamut mapping. I am assuming this is the tonemapping code: https://github.com/xbmc/xbmc/commit/787a...0264901953 It looks like for tonemapping, it assumes the source gamma is 2.4 (I could be wrong here).
