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Reference: pmEdgeDetection

pmEdgeDetection(pm), where pm is a pixmap, returns the pixmap containing the grey-scaled edges of pm.

pmEdgeDetection(pm, "horizontal"), where pm is a pixmap, returns the pixmap containing the grey-scaled edges of pm. Only horizontal edges are detected.

pmEdgeDetection(pm, "vertical"), where pm is a pixmap, returns the pixmap containing the grey-scaled edges of pm. Only vertical edges are detected.