Accented Edges filter
Filters > Brush Strokes > Accented Edges
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Ink Outlines filter
The Accented Edges filter searches out the edges within a picture and then highlights them with a line.
The size of the line is controlled by the Edge Width slider (1) in the filter’s dialog. The dark or lightness of the line is determined by the Edge Brightness slider (2). A high value produces a lightly colored edge that appears like chalk and a low value, like the one used in the illustration ...