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Hi Philip, it certainly looks better, but not there yet.
I did a screen grab of your image, imported it into Photoshop and used the "Enhance/Adjust Colour/Remove Colour Cast" tool, selecting the polar ice cap as my white point. I also increased the black level a little to make the area around the planet black. This was the result. There's probably a similar tool in Gimp. This has done a pretty good job, the colours look about right, and you can see the dust storm as a slightly different orange colour on the LHS of the planet.
I've not used imPPG for planetary, my usual workflow is FireCapture/AS!3/Registax/Photoshop Elements, which works for me.
Andrew
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