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I am not sure if a screenshot is needed. Basically, I have rendered a sequence in open EXR Multilayer 32 Bits.

When I import the files into a new Blender file in the compositor I can see the cryptomattes scrolling around the Main node (view layer). But when I use the cryptomatte node and plug the combined dot into the crypto matter does not show anything in the picker.

Do you know how can I solve this?

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Thank you

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  • $\begingroup$ @MartyFouts Done :) $\endgroup$ Dec 20, 2021 at 15:48
  • $\begingroup$ Check the updated thread...There is what you are advising me.. $\endgroup$ Dec 20, 2021 at 16:11

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As you can see on the node, you have the choice between Render and Image, that is because the node works in different ways when you use a Render Layer node or an external image sequence.

So push down the Image button. Then you will have to manually load up the image sequence, manually set the Frames and Start Frame (just mimic what you have in the Image Sequence node)m and set the view layer drop down.

example picture

Also make sure you don't use DWAA compression for your EXR sequence, otherwise it will look like this:

DWAA example picture

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  • $\begingroup$ Thank you so much....I used DWAA :( Noooooo hahahha But then the 32 bits are extremely heavy for my hard disk . Thank you so much $\endgroup$ Dec 20, 2021 at 16:32
  • $\begingroup$ Hi. I am trying your advice. Is not working. I loaded the EXR in the Cryptomatte node as an image sequence. I can see the masks, but I can not select the one I want by using the + button...nothing happens. $\endgroup$ Jan 3, 2022 at 9:53
  • $\begingroup$ You have to switch to the Pick output in order to be able to select the matte IDs you need. Also, I said to avoid DWAA, but I didn't say to not use any compression. DWAA breaks passes, just use basically any other compression method, like Pxr24, that would work. DWAA is fine only for regular color/beauty output, not for data/passes. $\endgroup$
    – L0Lock
    Jan 3, 2022 at 21:29
  • $\begingroup$ Thank you, picking from masks was not working. I still find the cryptomatte a bit un-streamlined. Could be easier if the actual EXR multilayer allows to pick from that....instead of reloading again the same thing. I will try the other compressions :) $\endgroup$ Jan 4, 2022 at 10:44
  • $\begingroup$ Ok I found out why was so hard for me to click on the masks. I do not use the backdrop feature. I use the image editor window showing the viewer node. Apparently the eyedrop does not work on that image. I guess I can not escape from using the backdrop feature. $\endgroup$ Jan 4, 2022 at 11:01

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