Forums Technical Discussion ACES image different in Nuke

ACES image different in Nuke

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happybabywzy
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I imported images(EXR) rendered in Karma into Nuke, and they also used the same ACES color space, but the colors were completely different,Why?

Houdini21.0.440

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image.png (1.2 MB)

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happybabywzy
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I attach one frame

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test8.karmarendersettings.0120.part1.rar (10.0 MB)
test8.karmarendersettings.0120.part2.rar (6.6 MB)

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protozoan
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To me it looks like you're using an older Nuke color config. Check the one that says ..aces-v1.3_ocio-v2.1 in the dropdown of your project color settings.. then the Nuke viewer config should also say the same as mplay: ..SDR video (sRG - Display) instead of sRGB(ACES).

See if that improves it.
Martin Winkler
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Heileif
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Did you set ACEScg as output colorspace in the Karma render settings?
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Xue_Yue
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Also this SDR-Video is an additional tonemapping on top of aces as far as I know.
You would need to the same ACES Profile in Nuke and the same tonemapping applied to get the same image result.
Edited by Xue_Yue - 2025年10月31日 04:54:27
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happybabywzy
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How to set ACEScg as colorspace in the Karma render settings? I dont know where this parameters located
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happybabywzy
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when I render it to mplay, it looks what i want it to be ,but when i render to disk as EXR,then import it to NUKE,it looks difference as Houdini mplay.........

and I use ACES color space rendering and Nuke for comp a long time, it always works correct ,until I use Houdini21....

lots of problem such as denoise aov error
https://www.sidefx.com/forum/topic/102285/ [www.sidefx.com]
Edited by happybabywzy - 2025年11月2日 22:17:14
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Xue_Yue
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Edit -> OCIO Settings ...

There you can see the defaults for your Houdini Scene and on the bottom it shows which *.ocio file is loaded. Make sure your Nuke uses the same ACES profile or at least the same version and the same view transform.
Edited by Xue_Yue - 2025年11月3日 06:39:38
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Heileif
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Did you set the Output Colorspace in Karma Render Settings to ACEScg?
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happybabywzy
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Heileif
How to set ACEScg as colorspace in the Karma render settings? I dont know where this parameters located

How to set ACEScg as colorspace in the Karma render settings? I dont know where this parameters located,can you give a snapshot?
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Heileif
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Here

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Screenshot 2025-11-10 174144.png (63.7 KB)

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happybabywzy
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Thank you Heileif
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