Change color intensity stroking along a path

[rich2005]

(09-25-2021, 08:23 AM)denzjos Wrote: I wonder if one can use gimp to change a colour intensity along stroking a path depending on the length of the path : from zero saturation on the start of the path to full saturation at the end of the path.

The GEGL saturation tool Color -> Saturation is a bit peculiar, the scale is 0 to 10, however zero is desaturated so, 

You could try stroking the path, with the paint tool, using the  dynamic color from gradient and a suitable fade length.

The gradient from the-colour-used to the-colour-used desaturated. This example, the primaries desaturated in separate image to colour pick.

   

Someone will probably come up with a script for this, I thought I remembered one but not able to find it.