Using the Highlight Effect

Using the Tone effect, you can apply a highlight to a drawing. Contrary to the Glow effect, the Highlight effect does not convert your drawing into a glow, it applies the glow onto your drawing. The resulting render includes both the drawing to its glow.

The Highlight effect uses a matte drawing layer to determine which areas of the drawing to apply the highlight to. The highlight will not be applied outside of the drawing or outside of the matte.