Pixaflux
Curve Color node
Left Toolbar > 
Create Nodes > 
Curve Color node
The Curve Color node takes as input Curves and adds a fill color and a stroke color to them.
input
Curve
output
Img
Image with a grow filter of 5 x 5 pixels.
Procedure
To add color to curves:
On the left toolbar choose Create Nodes > Curve Color.
> Drag the Curve Color icon into the Node Graph.
Connect a curve value to the curve input.
Inputs
curve Curve.
Outputs
image An image with the colored curve.
Attributes Panel
Attributes
Color Defines the background color and opacity.
Fill Defines the fill color and opacity.
Stroke Defines the stroke color and opacity.
Width Defines the width of the stroke.
Enlarge Enlarges the image around the bounding box of the curves.