error Invalid LUT selected : Gamma2.2
Use case:
While working in an ACES color management project, when you use the default toolkit publishing, it fails with an error Invalid LUT selected : Gamma2.2.
What’s causing the error?
There is an app that creates the quicktime that is a part of the toolkit publishing from Nuke called tk-multi-reviewsubmission, and by default it will create a QT that works with Nukes standard color model.
How to fix
Since you are using ACES (I’m assuming the ICIO model), we just need to change the colorspace setting in the tk-multi-reviewsubmission app by taking over and adding it into the codec_settings.py hook.
Codecs vary per preference, but in this example, we’re using the Output - sRGB Codec: So in the codec_settings.py hook add the setting settings["colorspace"] = "Output - sRGB" to where it makes sense for your setup. (I’ve just added it everywhere)
settings = {}
if sys.platform in ["darwin", "win32"]:
settings["file_type"] = "mov"
if nuke.NUKE_VERSION_MAJOR >= 9:
# Nuke 9.0v1 changed the codec knob name to meta_codec and added an encoder knob
# (which defaults to the new mov64 encoder/decoder).
settings["meta_codec"] = "jpeg"
settings["mov64_quality_max"] = "3"
settings["colorspace"] = "Output - sRGB"
else:
settings["codec"] = "jpeg"
settings["colorspace"] = "Output - sRGB"
elif sys.platform == "linux2":
if nuke.NUKE_VERSION_MAJOR >= 9:
# Nuke 9.0v1 removed ffmpeg and replaced it with the mov64 writer
# https://help.thefoundry.co.uk/nuke/9.0/#appendices/appendixc/supported_file_formats.html
settings["file_type"] = "mov64"
settings["mov64_codec"] = "jpeg"
settings["mov64_quality_max"] = "3"
settings["colorspace"] = "Output - sRGB"
else:
# the 'codec' knob name was changed to 'format' in Nuke 7.0
settings["file_type"] = "ffmpeg"
settings["format"] = "MOV format (mov)"
settings["colorspace"] = "Output - sRGB"
return settings
Now if you got all that right then when you publish in Nuke the QT will be made in an ACES compatible colorspace!