Performs an edge detection of the high-contrast borders between regions of differing brightness in an image, tracing the edges and reducing other detail in the image to the color specified by the Paper Color parameter. The color of the resulting outline can also be customized. The effect is that of a line drawing on paper.
Adjust this filter using the parameter controls in the Filters Inspector:
Threshold: Sets the threshold of edge detection.
Smoothness: Sets the level of smoothness of transition between the lines and the background.
Paper Color: Sets the color of the paper. Click the disclosure triangle to reveal individual Red, Green, and Blue sliders to more precisely select the color.
Paper Opacity: Sets the opacity of the paper.
Ink Color: Sets the color of the ink used in the line drawing.
Mix: Sets the percentage of the original image to be blended with the filtered image.