ID 360927 - A discrepancy in color values occurs when applying the LUT soft effect and comparing it to a rendered file with the same LUT from Nuke.

Problem summary
A discrepancy in color values occurs when applying the LUT soft effect and comparing it to a rendered file with the same LUT from Nuke.

Customer reported version

Hiero 11.2v1

Customer reported platform
10.12

Steps to reproduce:

Part 1:

1. In Nuke, create a Read node and add an image.

2. Create a Vectorfield node attached to the Read node above.

3. Open the Vectorfield properties and apply a vectorfield file (LUT), while also setting the colorspace in & out knobs as: AlexaV3LogC.

4. Add a Write node with the colorspace set as: AlexaV3LogC and render a .dpx file. ("Alexa_Alexa.dpx")

Part 2:

5. In Hiero 11.2v1, create a new sequence.

6. Import the original image used in the Nuke script and place it on the Timeline.

7. Right-click the shot and select Effects > LUT. Open the Properties of the OCIOFileTransform soft effect and set the working space knob as: AlexaV3LogC.

8. Import the Alexa_Alexa.dpx file rendered from Nuke, and open the properties to set the colorspace knob as: AlexaV3LogC.

9. Place the Alexa_Alexa.dpx on the Timeline above the original file into Video Track 2.

10. Disable the Video 2 layer to observe the difference in lighting/colorspace values.

Additional steps/Workaround:

11. Right-click on the original "Video 1 track" and export the file as a .dpx - ensure to only export Video Track 1.

12. 'Delete the Video 1 Track', import the newly rendered .dpx, and place it on the Timeline for Video 1.

13. Open the properties for the newly imported .dpx and changed the colorspace to: AlexaV3LogC.

14. Disable the Video 2 layer and noticed any difference in lighting.

Workaround
Export the soft effect applied to the clip on the Timeline, and then re-import the clip to use.

An additional workaround is to add a custom Viewer, which can be done by following this link: 
https://support.foundry.com/hc/en-us/articles/206906950-Q100196-Applying-a-custom-Viewer-Process-in-Nuke-and-NukeStudio-Hiero

Reproduced by support

Hiero/NukeStudio 11.2v3 - Windows 10, CentOS7, macOS 10.13

Hiero/NukeStudio 11.2v1 - Windows 10,

Hiero/NukeStudio 11.1v5 - Windows 10

Hiero/NukeStudio 11.1v1 - Windows 10

Hiero/NukeStudio 11.0v4 - Windows 10

Hiero/NukeStudio 11.0v1 - Windows 10

Hiero/NukeStudio 10.5v7 - Windows 10

Hiero/NukeStudio 10.5v1 - Windows 10

Hiero/NukeStudio 10.0v6 - Windows 10

Hiero/NukeStudio 10.0v1 - Windows 10

Hiero/NukeStudio 9.0v9   - Windows 10

Hiero/NukeStudio 9.0v1   - Windows 10, CentOS7, macOS 10.13

Earliest version tested
NukeStudio/Hiero 9.0v1 - This issue appears to be in all versions of the product

Expected behaviour
The LUT soft effect should apply the same color values when comparing the exported Nuke file with the same settings applied.

Actual behaviour
The applied LUT soft effect has a color value that does not match the exported footage from Nuke with the same settings.