how use cryptomatte in octane

[dobe]

is there a manual or tutorail how to use cryptomatte in blender with octane?

i need black-white mask for photoshop retouch.
If I enable cryptomatte in view layer properties and activate the different options, the result looks always like a broken pixel outline?

some tipps?

Testscene: https://we.tl/t-u8DmtuPFn3

[pegot]

I think you will only see the actual masks when bringing the files into an app that supports cryptotomatte. For example, I use After Effects. Once I apply the Cryptomatte plugin, the various ways of accessing the mates become available. In After Effects, you have to click on a color that represents whatever object or material you set the mattes to in order to isolate that particular object or material. Once that is done in the manifest you can begin to use the selection as a mask.

However, it appears the Cryptomattes are only working with Octane output. Your file does not have Octane output selected. And if the default blender output is used I am not seeing any proper mattes being generated.

Could the devs step in to confirm that Cryptomattes only work with Octane output?

[dobe]

thank you mate. this is the solution -> OCTANE OUTPUT
now, my photoshop plugin exr.io can read the cryptomatte masks correct

[llennoco22]

Seems to work fine for me, cryptomatte can be used as such in Blenders compositor. Just input Octanes crypto outputs to the cryptomatte node, eye dropper the objects you need from the pick output and it will generate a mask and matte. https://i.gyazo.com/6ac9e42daf193b8f42f ... 902964.mp4

[protovu]

Thank you for the nice explanation!

[crackfox]

llennoco22 thanks, i was wondering this myself and will surely use your post as reference.

[linograndiotoy]

Could the devs step in to confirm that Cryptomattes only work with Octane output?

Yes, that's confirmed.