Author Topic: Tonemapping - Plz Halp  (Read 83535 times)

2021-12-07, 11:23:03
Reply #435

piotrus3333

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@piotrus3333 do you have LUTs for these, I'd like to test them out(?)

this is output from CIE with mP_LogCorona2VRayAMPAS.3dl and 1 stop of exposure correction (I did the same in VRay - srgb raw was brighter than acescg).
conversion was: VRay's raw acescg >> srgb >> CIE >> -1 exp >> log lut

edit: I mean VRay's raw acescg >> lin srgb >> CIE (-1 exp, log lut)
« Last Edit: 2021-12-07, 12:11:18 by piotrus3333 »
Marcin Piotrowski
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2021-12-07, 12:09:02
Reply #436

piotrus3333

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apologies, forgot about 2.2 >> srgb.
corrected E and F from CIE (rough 2.2 >> srgb done in photoshop).
Marcin Piotrowski
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2021-12-07, 22:46:57
Reply #437

burnin

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For some finer orientation around color spaces, here's an an excerpt from Jorgen HDRI's comparative study on digital color, shared over @ "ACES for CGI" Discord:
Quote
I decided to test TCAM v2 today after reading this server. Based on Chris' color sweep tests it looks like it handles color mapping better than the ACES color transform (I'm sorry for butchering the nomenclature). My hope is to find a solution that provides me with the most accurate colors based on my own workflow and available hardware/software.

This test is an s-log2 shot (not CGI, I'm sorry Jin), which I had to store in a different log format (ACEScc), since the TCAM OCIO-config doesn't include s-log2 specifically. Also, I'm comparing the TCAM sRGB output to the ACES rec.709 output, since the ACES sRGB output had way more contrast and crushed blacks than rec.709, compared to TCAM sRGB output.


Dislaimer
I tried making these comparisons a gif, but really, that's a stupidly bad idea. So instead, here's a bunch of PNGs you can open in a browser and tab between to see the difference between how the different configurations handles the input colors and dynamic range.





Quote
Let's just say these daffodils are orange IRL, very much like what TCAM is producing, not neon yellow like what ACES does.


PS
What I want to convey is, first a proper IRL reference must be established and only after a search for best CGI practice can commence. 
« Last Edit: 2021-12-07, 22:52:00 by burnin »

2021-12-08, 00:05:36
Reply #438

piotrus3333

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PS
What I want to convey is, first a proper IRL reference must be established and only after a search for best CGI practice can commence.

heh, and I was going for something simpler like: there is nothing wrong with tone mapping in Corona.
Marcin Piotrowski
youtube

2022-02-09, 14:06:12
Reply #439

piotrus3333

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