SSmolak wrote:The problem is that saving Filmic OCIO as 32bit EXR do nothing - it lose 32bit depth and it looks the same as saving using Highlight Compression. I compared it in Photoshop and Affinity Photo. Exporting OCIO from Cinema 4D Octane even as 32bit linear EXR flatten it to 8 bit. Maybe this is bug ? Exporting as ACES works fine.
Bit Depth and Export
There are no problem, issue or bug. Nothing is lost when exporting as 16 or 32-bit depth EXR.
When using the Filmic OCIO solution, exporting as 32-bit* EXR will default to a Linear-scene-referred** encoded EXR (without any OE/EO-TF applied).
This is normal if "it does nothing" because it should not, when exporting as such (OpenEXR).
ACES is the exact same, exporting with it as OpenEXR would mean exporting a Linear-scene-referred EXR (Linear-ACEScg instead of Linear-sRGB) and since it is in linear, it means that it is still exported without any OE/EO-TF applied and so, the appropriate ACES ODT has to be apply in post, same as Filmic which has to be re-applied in post, at least when exporting as OpenEXR.
The page is incomplete (in my opinion) but should give solid pointers to what "Linear" means: https://www.elsksa.me/scientia/digital-imaging/linear-in-digital-imagery
Photoshop or Lightroom recommended (and more appropriate) workflow
Regarding Photoshop (or Lightroom aka LR), it does not natively fully support 32-bit EXR and processing as it should and is not considered as an alternative to Nuke or Fusion which are much more reliable in that regard (and designed for VFX/CGI post-production).
This is why it is recommended (for PS/LR) to export a 16-bit TIFF with the Filmic Log Base Encoding applied, so an "s-curve" can be added in PS/LR or loading one of the provided contrast LUT from the Filmic OCIO package (if PS/LR are compatible with the given LUT format if not, a conversion to a supported LUT file format is still possible).
*is not recommended, 16-bit is for beauty. 32-bit is appropriate for data AOVs (normal, world position, etc). There are more information here:
https://www.elsksa.me/scientia/cgi-offline-rendering/the-unawareness-of-png-and-exr
** There is a section that covers the meaning of the terms "scene (or) display referred": https://www.elsksa.me/scientia/cgi-offline-rendering/cgi-color-management-survival-kit
I hope it did clarify some of the confusion and misconceptions. Feel free to ask any further questions.