Custom Metadata in rendered images

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Carlo Giesa

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Sep 4, 2025, 6:53:43 AM (5 days ago) Sep 4
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Hi there!

Is there any way to get custom metadata stored in rendered EXR images when using the Arnold renderer? I would like to define custom text on AOVs to be able to group them together in a downstream process.

Thanks for any hint!

Greets,
Carlo

Carlo Giesa

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Sep 4, 2025, 8:41:39 AM (5 days ago) Sep 4
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Ok, I could figure it out. Just in case, someone is interested. This is how it must be declared on the Outputs node:
Screenshot from 2025-09-04 14-33-48.png

John Haddon

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Sep 4, 2025, 9:13:36 AM (5 days ago) Sep 4
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That's the Arnold-specific way, where you have to manually format everything you want into a weird string. There's a better way in Gaffer that will work across all the renderer backends - just add any number of `header:<name>` parameters of any type, where `<name>` is the name you want the metadata to have in the file...

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Carlo Giesa

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Sep 4, 2025, 9:34:37 AM (5 days ago) Sep 4
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Ah yeah, indeed, that works as well. Thanks for the hint!

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