With Canon Rebel 450D and 70-250 lens with polarized filter,photos had discolorations with swaths of yellow to purple across photos.Defringing of no help.Working with histogram no help. No online ideas useful.any suggestions? Using Lightroom 6 and DXo software. Any solutions/
I can't speak for DxO, but I doubt this is something that can be done easily in Lightroom, if it can be done in Lightroom at all.
You could try the Adjustment brush with the Moire slider, not sure if it will work, though.