ggarra13/mrv2

mrv2 v1.1.3 - OCIO looks clamped

Closed this issue · 5 comments

dynestudio commented

Hi!

I installed the new mrv2 v1.1.3 build and looks like it has an issue with OCIO color space transform, the colors looks incorrect, I think that they are clamped somehow. Here you can see a comparison between mrv2 with Fusion and Chaos Player:

Fusion_BXh3RMJJbQ

Here is the exr file if you want to make tests with the same file:

https://www.dropbox.com/t/NFjON3ONUgbS2RBR

I'm using this OCIO config file in case you wonder:

https://github.com/TheArtofSaul/RedshiftOCIOConfigs/blob/main/redshift-custom-config/config.ocio

Cheers!

ggarra13 commented

Your image seems to have transparency all over and it is getting comped over the default dark gray background of mrv2.

You can probably get the image without any alpha compositing if you do:

Render->Alpha Blend->None.

dynestudio commented

@ggarra13 thanks for your quick answer, you are right, the alpha compositing was affecting the image, it looks closer now but it still doesn't match yet, what do you think can be causing this now?

Fusion_Mx7NZ6YHdB
ggarra13 commented

@dynestudio I don't know as I never used Redshift. Some odd things about your last image:

  1. Redshift's OCIO config is empty. Are you sure you are using the same one?
  2. The frame number on each viewer is different. Are you sure the color does not change?

Work for home:

  1. Instead of using Redshift's config.ocio, use one of mrv2's config.ocio (in the ocio dir of mrv2 installation) and see if you still get discrepancies.
  2. Transparency is tricky and each renderer may do it differently. Do a quick test scene with no transparency and see if you still get discrepancies.
  3. See if you can reproduce the results (of either Redshift or mrv2) with some other program like a compositing software like Nuke or AE.
ggarra13 commented

The bug has been fixed in the recently release v1.1.4. Closing the issue.