Author Topic: Tonemapping - Plz Halp  (Read 76023 times)

2021-12-02, 20:46:08
Reply #420

piotrus3333

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Awesome, is this the same as the hardcoded LUT that FStorm uses as a base?

heh, no. not the same. Fstorm’s curve has a few adjustable parameters and is not very straightforward. this is fairly decent aproximation of the defaults. you can send low res raw exr from corona and I can show you the difference. this lut relies on reinhard starting point so images with lower dynamic range get more noticable difference.
Marcin Piotrowski
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2021-12-02, 20:53:13
Reply #421

lupaz

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Thank you Piotrus.

I like Reinhard2VrayAMPAS, which seems to be very similar to Dubcat's Cannon 5D Mark I.

In my opinion Reinhard2FstormDefaults is way too saturated.

2021-12-02, 21:05:30
Reply #422

dj_buckley

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Thank you Piotrus.

I like Reinhard2VrayAMPAS, which seems to be very similar to Dubcat's Cannon 5D Mark I.

In my opinion Reinhard2FstormDefaults is way too saturated.

Couldn't agree more, Reinhard2VRayAMPAS is the one I keep going back too, it's almost perfect.  Even the 5D one you mention I find just that little bit too saturated and contrasty.

Edit: Ignore that bit about the 5D one, I was getting mixed up.  Yes they're both incredibly similar.  The 5D one has a little more punch to it
« Last Edit: 2021-12-02, 21:10:00 by dj_buckley »

2021-12-02, 21:13:45
Reply #423

cjwidd

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I've learned *A LOT* from Dubcat, so no offense, but I feel like my encounter with his Photographic LUTs early on while learning Corona Renderer, really led me astray. The 5D Mark 1 and 5DS LUTs produce a much more natural look, which is probably a better starting point when pursuing an un-edited photographic look.

2021-12-02, 23:56:03
Reply #424

cjwidd

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@piotrus3333 are you sure that the VFB doesn't render .cube vs .3dl differently? It looks like there is some color burn, or something, using the .3dl in VFB LUT, compared to .cube(?) Testing mP_Reinhard2FstormDefaults_v1.3dl.

2021-12-03, 00:09:59
Reply #425

piotrus3333

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one more.
since ampas seems to be the winner - this is more precise version of VRayAMPAS lut. check input LUT is in Log color space and leave HC at default (or you can actually use it to move the white point up or down).
Marcin Piotrowski
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2021-12-03, 00:23:28
Reply #426

piotrus3333

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@piotrus3333 are you sure that the VFB doesn't render .cube vs .3dl differently? It looks like there is some color burn, or something, using the .3dl in VFB LUT, compared to .cube(?) Testing mP_Reinhard2FstormDefaults_v1.3dl.

this one is quite saturated. format shouldn't matter but I've never checked that in Corona to be honest. first luts I posted were linear in 3dl format and 2.2 in cube. recent ones are all 2.2 in 3dl. corona does backflips with gamma in vfb.
Marcin Piotrowski
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2021-12-03, 10:27:34
Reply #427

dj_buckley

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I've learned *A LOT* from Dubcat, so no offense, but I feel like my encounter with his Photographic LUTs early on while learning Corona Renderer, really led me astray. The 5D Mark 1 and 5DS LUTs produce a much more natural look, which is probably a better starting point when pursuing an un-edited photographic look.

Yep, it's the 5DS one I've been testing actually not the Mark 1.  If you're albedos stay within the stricter ranges, it produces a really nice starting point.

2021-12-03, 14:08:50
Reply #428

Bjoershol

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I've learned *A LOT* from Dubcat, so no offense, but I feel like my encounter with his Photographic LUTs early on while learning Corona Renderer, really led me astray. The 5D Mark 1 and 5DS LUTs produce a much more natural look, which is probably a better starting point when pursuing an un-edited photographic look.

Yep, it's the 5DS one I've been testing actually not the Mark 1.  If you're albedos stay within the stricter ranges, it produces a really nice starting point.

Can these LUTs be found anywhere for download? Would love to test them out. :)

2021-12-04, 11:24:25
Reply #429

dj_buckley

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They're in this thread - the 5DS one I have is attached

2021-12-04, 20:19:49
Reply #430

Bjoershol

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Thank you, appreciate it. :)

2021-12-06, 14:41:42
Reply #431

piotrus3333

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My only expectation is that colors don't get so saturated on hotspots. I believe that was part of the conversation here on this thread. For example, when the sun hits wood you get a yellowish halo around the white area. Yes, you can lower the overall saturation, but you're affecting the entire image. Reinhardt or crunching the whites don't seem to work as if you were working with an HDR. I may be wrong and I'm far from an expert in the subject.

hello again.
regarding the burning need for ACES in Corona - at least for those not in film/vfx - please spare a moment and have a look at these two. the difference is internal color space: ACEScg vs sRGB. so wide gamut vs, well, narrower gamut. Corona's internal is wide from day one (remember this one from 2014: "wow, Corona has such a nice natural lighting").

so how do these two look?
Marcin Piotrowski
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2021-12-06, 22:46:01
Reply #432

cjwidd

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Tough, they both look good - obviously the blue tone shadow stands out in the 'ACES_test_F' version, and the props look better in 'ACES_test_F', but the strong blue tone on the white shader ball (upper left) is very noticeable.
« Last Edit: 2021-12-06, 22:56:48 by cjwidd »

2021-12-07, 02:51:56
Reply #433

cjwidd

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

2021-12-07, 09:27:34
Reply #434

piotrus3333

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

these are as plain as possible. just raw srgb and acescg with tone mapping. ampas curve for srgb and default srgb transform for acescg. so pretty much the same curves. fancy lens to make them look a bit less synthetic.
Marcin Piotrowski
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