ID 134777 - A difference in transcoding occurs when rendering Alexa ProRes footage

Problem summary
A difference in transcoding occurs when rendering Alexa ProRes footage.

Customer reported version
nuke.12.0v4

Customer reported platform
windows10

Steps to reproduce

1) In Nuke, Read in an Alexa ProRes .mov file.

2) Create a Write node and render the frames to Apple ProRes 422 or 4444.

3) Read in the rendered footage and set the Viewer for 10x gamma.

4) Compare the results of the original versus rendered footage.

Expected behavior
The Alexa ProRes footage should appear the same.

Actual behavior
There is a slight difference in color/sharpness when rendering a ProRes 4444 QuickTime from Alexa original footage; the transcoding is not correct.

Workaround
There is no available workaround at this time.

Reproduced by Support in
Nuke 12.0v4 - Windows 10

Nuke 12.0v3 - Windows 10

Nuke 12.0v1 - Windows 10

Nuke 11.3v5 - Windows 10

Nuke 11.3v1 - Windows 10

Nuke 11.2v1 - Windows 10

Nuke 11.1v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.5v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke  9.0v1 - Windows 10

Nuke  8.0v1 - Windows 10

Earliest version tested
Nuke 8.0v1 - This issue appears to be in all versions of the product