Long time user of Gimp, DarkTable here (on Linux) and I’ve always, literally ALWAYS struggled with colorcasts. Somehow managed to do post but some images were just too bad to correct.
Yesterday, my wife asked me to shoot her and her horse and we found a couple of nice places to do so. Overcast but very bright summer sky and dumb me planted the pair below some neat trees for background with a horrible green cast as a result.
I did not want to let this cutesy pic of them go to waste and my wife loved the expression of love and trust between animal and human so I promised to do my best.
Came across this Youtube tutorial which is so straightforward and easy to use, it’s almost embarrassing I didn’t catch on over the last 15 years or so. https://www.youtube.com/watch?v=gr692iyYBUI
Filters/Blur/Pixelize? Of all filters? I do not think I have ever in my wildest dreams found any use for it ever before.