01-05-2019, 09:44 PM
Not directly, but you can:
1) apply a plain linear black to white gradient
2) Use Curves (or, in the simpler cases, Levels) to map to another gradient.
1) apply a plain linear black to white gradient
2) Use Curves (or, in the simpler cases, Levels) to map to another gradient.
In other words, you can see the initial gradient as indicating how far you are from the border, and the Curves as mapping that distance from the border in to a grey level.
3) Once you are done, you can use Color>Map>Gradient map to transform that grayscale gradient in to any gradient: