Here the 'gradient stops' are (necessarily) positioned on the path and represented by the circles. This could lead to an on-canvas interface (using an extended gradient tool) that looks a bit like this:

Or (only a single color per point on the path and no blur): Instead of defining a group that gets diffused it may also make sense to use subpaths and diffuse those: Or by simply treating diffusion curves as yet another paint server. Normally diffusion curves will have infinite extent, but this can be controlled when needed by surrounding a set of curves with a closed path that has an outside boundary which is fully transparent. This is useful for depth of field effects for example. Note that with diffusion curves the blur itself can also vary along the path, which could be used in the above image to let the edge be sharper in some areas. For example (don't mind the exact attributes):Īssuming that the two gradients are made to go from #F00 to #00F and vice versa this would roughly look like this (note that this is just a rough approximation):

Colors at nodes / gradients defined on paths (on one or both sides of the curve)ĭiffusion curves could be represented by paths with gradients attached to them, along with an enclosing group that says that the colors should be diffused within that group.

Here the following features are considered: The links at the bottom define various features that can be useful for Diffusion Curves.

Inkscape gradient on a path