Traces an image’s edges and reduces its colors, to make it look like a comic illustration.
Blur Radius— The maximum radius, in points, to affect when applying blur before tracing. Useful for reducing noise and giving the image an airbrushed look.
Edge Color— The color to draw the image’s edges.
Edge Width— The size, in points, of the image’s edges.
Edge Threshold— How picky to be about what constitutes an edge. Lower values result in more edges; higher values result in fewer edges.
Image Colors— How many variations of each color channel to use when filtering a pixel. For example, a value of 6 means that the Red, Blue, and Green channels that make up a color will each have 6 shades, making 216 total color possibilities (6 * 6 * 6).
Show Image— Whether to show the (blurred) original image behind the traced lines. If false, the edges will be drawn and the rest of the image will be transparent.
Thanks to Brad Larson and Martinus Magneson for the GLSL implementation this node is based on.
Keywords: airbrush, comic, contour, filter, hand-drawn, illustration, line art, sketch, stroke