Community
Arnold for 3ds Max
Rendering with Arnold in 3ds Max using the MaxtoA plug-in.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

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

7 REPLIES 7
SOLVED
Reply
Message 1 of 8
kyanetemadi
5463 Views, 7 Replies

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?

Tags (3)
Labels (3)
7 REPLIES 7
Message 2 of 8
Stephen.Blair
in reply to: kyanetemadi

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



// Stephen Blair
// Arnold Renderer Support
Message 3 of 8
kyanetemadi
in reply to: Stephen.Blair

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

Message 4 of 8
Stephen.Blair
in reply to: kyanetemadi

Right, you can ignore them



// Stephen Blair
// Arnold Renderer Support
Message 5 of 8
jedwardsLR575
in reply to: kyanetemadi

Hey Stephen, I know this is a fairly old thread, but I did want to give you props for posting the reply. I recently swapped over to ACES and noticed the same issue happening to me. The XML file worked like a charm.

Message 6 of 8

Hi Jared, which XLM file? Where i'll find it, and How it works? I would love to know. thanks 🙂

Message 7 of 8
sputknick
in reply to: kyanetemadi

Yes, I sure would like to fix this, not ignore it. Is there a way to get rid of this or change some setting in some texture somewhere? What is this XML file you are mentioning?

Message 8 of 8
thiago.ize
in reply to: kyanetemadi

The "compression has a bug for monochrome images" issue was fixed a couple years ago. Have you tried updating Arnold? https://www.arnoldrenderer.com/download/

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report