Just adding a link to another thread that is relevant to this thread...

viewtopic.php?p=443679#p443679

Ok, call me stupid for taking so long to figure this out, but it seems the 'correct' way to save a Multi-layer EXR from Blender Octane is to use the Octane Output filepath and options to automatically save your render on completion. This gives me correct color management and cryptomatte into ...

Thanks, yes I will try what you suggest. I was previously just saving a multi-layer EXR using the save icon in the Octane Viewport toolbar (how I've done it for years in Modo Octane) using Blender Octane edition. This gave me the correct Cryptomatte and color management into Photoshop, but then the ...

Thanks Lino. I would like to just use the standard Blender Viewport but I need to save the file as Multi-layer EXR with Cryptomatte and the Blender Viewport saved file will not open the Cryptomatte layers correctly in Photoshop and the Beauty pass color is different (see this old thread https ...

Hi, I'm having an issue where whilst rendering the Octane Viewport is normal, but as the render completes the image is replaced with grey and the toolbar is mostly greyed out. This happens with fresh scenes.

Using Blender 5.1.2, Octane Add-on 31.8.0 on Win.

During render...

blender_octane_addon ...

Thanks very much Gutmann, that does work :) and is a useful workaround. I've also opened each of the EXRs again in notepad (first from Blender Octane using the Octane Viewport to save as you suggested (works), second from Modo Octane (works) and third from Blender Octane using the Blender Image ...

I'll also attach the EXR files as saved from Modo Octane and Blender Octane. I opened them in notepad and can see that the layer naming appears to be different. Modo Octane layers referenced with a 2 digit number eg. CryptoMaterialNode00.r and there are more of them whereas the Blender Octane file ...

I'm attaching screengrabs of how the Modo Octane EXR opens in Photoshop vs how the Blender Octane EXR opens in Photoshop, both using the ProEXR plugin (no cryptomatte layer support) and the Exr-IO plugin with Cryptomatte Layers disabled but Cryptomatte Raw Data enabled...

This seems to be an Octane specific problem because I tried rendering the same scene with EEVEE in Blender and it all worked correctly.

Also, I have asked on the Exr-IO Discord where it was recommended that I follow the workflow as described in the video https://www.youtube.com/watch?v=43TRMeQZlzA and the Add-on script at https://www.exr-io.com/automate-blender-exr-elements/