Color.blendSoftLight()

Darkens or lightens the colors, depending on the source color value.

If the source color is lighter than 0.5, the backdrop is lightened, as if it were dodged;
this is useful for adding highlights to a scene.

If the source color is darker than 0.5, the backdrop is darkened, as if it were burned in.
The degree of lightening or darkening is proportional to the difference between the source color and 0.5;
if it is equal to 0.5, the backdrop is unchanged.

Painting with pure black or white produces a distinctly darker or lighter area, but does not result in pure black or white.
The effect is similar to shining a diffused spotlight on the backdrop.