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SDR to HDR (Inverse Tone Mapping)

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jmone:
All good points which is why I created the 1min samples for review.  I'd value your opinion of what you thought of them TBH - even if it was "I told you so, they are rubbish". 

Edit: FYI - the two re-encode examples took FHD SDR to UHD HDR P3D65 in 2020 - so upscaling res, gamut (well I limited gamut to P3), as well as SDR to HDR (well I limited to 1000nits).  I was trying to replicate what it might look like if done in a renderer that did all of this using the most common UHD BD Spec.

mattkhan:

--- Quote from: jmone on May 29, 2023, 06:02:34 pm ---Anyone had a chance to have a look yet?

--- End quote ---
I'm not sure that viewing on a projector (so not tonemapped back down a fair bit) is going to be too revealing but my take....

* i find it slightly hard to judge content like this because it's literally an alien planet, i.e. I have no built in frame of reference for "that looks normal/weird"
* I didn't see anything obnoxious in either version
* both HDR versions looked a bit like they've just been run through some colour enhancing filter which operates particularly strongly on certain content but does v little to other content (which I guess it how that process works?)

FWIW the scene of them swimming through water was, subjectively to my eyes, the one scene where the difference was immediately obvious

I'll take a look on an OLED later to see if it looks any different there

jmone:
Thanks! I've not tried viewing these on a PJ, but on a HDR1000 P3 Display to keep additional tone/gamut mapping to a minimum.  I'd expect that they should look similar on a PJ but should look different on the OLED.  I picked this example as Avatar is pretty well known and the demo clip should not get me in trouble!  Trouble with this choice is it is all a very blue canvas. 

A couple of good comparisons frames for me are:
- 14 sec mark for overall gamut / PQ changes
- 25 sec mark for the highlights of the white floating thingie and also the waterfall at 41 sec
- 33 & 39 sec mark for skin tones

I also don't see anything weird per say, but I think my order of preference on these samples would be:
- HDR - Saturation Preserving, then
- HDR - Luminance Mapping (don't like the extra blue/purple shadows on the tip of his nose at 10 sec), then
- SDR

mattkhan:
Checked them out on a LG C1, luminance mapping is definitely rather intense to my eyes, like a vibrance filter.

Saturation preserving seems to blow the highlights a little bit.

SDR probably the best of them for me, quite small difference though tbh, not sure I would have a preference blind tested

jmone:
Thanks for the feedback.  Interesting!

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