ACES image different in Nuke

Forums Technical Discussion ACES image different in Nuke

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happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

Oct. 29, 2025 5:31 a.m.

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

Attachments:
image.png (1.2 MB)


happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

Oct. 29, 2025 5:35 a.m.

I attach one frame

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


protozoan: Member; 1821 posts; Joined: March 2009; Offline

Oct. 29, 2025 6:56 a.m.

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
money man at Alarmstart Germany


Heileif: Member; 270 posts; Joined: Jan. 2015; Offline

Oct. 30, 2025 3:08 p.m.

Did you set ACEScg as output colorspace in the Karma render settings?


Xue_Yue: Member; 80 posts; Joined: June 2016; Offline

Oct. 31, 2025 4:52 a.m.

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 - Oct. 31, 2025 04:54:27


happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

Nov. 2, 2025 10:10 p.m.

How to set ACEScg as colorspace in the Karma render settings? I dont know where this parameters located


happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

Nov. 2, 2025 10:13 p.m.

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 - Nov. 2, 2025 22:17:14


Xue_Yue: Member; 80 posts; Joined: June 2016; Offline

Nov. 3, 2025 6:39 a.m.

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 - Nov. 3, 2025 06:39:38


Heileif: Member; 270 posts; Joined: Jan. 2015; Offline

Nov. 4, 2025 4:39 a.m.

Did you set the Output Colorspace in Karma Render Settings to ACEScg?


happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

Nov. 9, 2025 6:42 p.m.

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?


Heileif: Member; 270 posts; Joined: Jan. 2015; Offline

Nov. 10, 2025 11:41 a.m.

Here

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


happybabywzy: Member; 143 posts; Joined: Feb. 2019; Offline

yesterday 6:52 p.m.

Thank you Heileif

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