Processing Challenge - PI Guru Required

[Radar]

As powerful as PI is, I'm struggling to find a way to get the background in this image flat and even. The image has a radial greenish tinge. I've played with automatic background extractor, dynamic background extractor, background neutralisation. I'm at a loss with PI on this. I've spent hours watching PI tutorials and replicating those workflows in regards to backgrounds without success on this image.

I would like a PI guru to inspect this image and possibly change remove the radial gradient seen in this background and then let me know what he / she did or what I'm doing wrong.

Any takers? The more the merrier.

http://www.filedropper.com/group1lrgbaberegisteredresampled

Regards

Ray

P.S Time is my enemy at the moment otherwise I would keep experimenting.

[wimvb]

Is the image stretched in any way? Background extraction is best done on linear images.

Can you provide a link to the stacked, but otherwise unprocessed copy of this image?

Cheers,