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Kyan E avatar image
Kyan E asked ·

I constantly get the Error Message: "OpenEXR "dwaa" compression has a bug for monochrome images, using "zip" instead"

Hey everyone.

I keep getting this error message when I hit the render in Arnold 4.0.1 (MtoA)

// Warning: [AiMakeTx] OpenEXR "dwaa" compression has a bug for monochrome images, using "zip" instead

Right now I have a simple scene: A plane and a lightdome with an HDRI from hdrmaps.com. Textures are from Poliigon.com (diffuse, glossy and displacement). I had that message before with other scenes but it never bothered me. Is this something I have to worry about? Renders come out fine, but the message is there all the time.


When I google the error message, Google is giving me a link: https://answers.arnoldrenderer.com/storage/attachments/5463-arnold.txt so I guess someone had the issue before, but all I get when clicking the link is an attached arnold.txt file (log file).


Maybe someone knows what it means and can explain?

mtoaerrormessage
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Stephen Blair avatar image
Stephen Blair answered ·

It's a warning, not an error.

Arnold uses OpenImageIO to load textures, and OpenImageIO put in that warning to deal with

bugs with DWAA/DWAB compression of OpenEXR images in
the specific case of 1-channel images where tile size is either < 16 or not a power of 2.

https://github.com/OpenImageIO/oiio/pull/2378

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I see. So there is nothing to worry about when Maya spits out the warning message?

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Right, you can ignore them

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