Hi Marc, based on a previous colour balance test on Jupiter, I reckon the white balance values to use (in Firecapture) are Wred=69, Wblue=86.
https://www.cloudynights.com/topic/7...tc/?p=10376048
Also, you can't use Registax to "auto-balance" predominantly single colour planets like Mars, Uranus and Neptune (and probably Saturn), as it tries to equalise the colour channels (which these planets are not). Jupiter works pretty well.
Saturn has a yellow hue - we might try to "correct" it out to make a nicer looking image, but it's yellowish/green in real life.
https://solarsystem.nasa.gov/resourc...rthern-summer/
https://www.cloudynights.com/topic/7...-final-report/
Andrew