I have this nice Lappland Autumn morning panorama, except the polariser effect is obviously too big just to the right of the small top on the left.
I would like to try to apply a kind of mask with a softly shaped triangular wedge covering the deepest blue part, but with a gradient around it, so that the corrections blend in better.
Once I have that, I can selectively manipulate the blue in GIMP.
So the first iteration of the question is: How do I do a mask with a gradient around a freehand shape in GIMP?
Alternatively, does anybody know a better way of correcting the sky? Thank you!