Apparatus are provided, which include a color image processor, an edge distinguisher, and an edge trapping mechanism. The color image processor processes color images, including a given color image. The given color image includes plural color separations each having a set of color values for respective image pixels. The edge distinguisher distinguishes some edges of the given color image as opposing edges. An edge is a transition in the color separation of the given color image from a non-white color intensity value, at one side of the edge, to a white intensity value, at the other side of the edge. A given edge is an opposing edge when a transition of the given edge goes, for a separation of the given color image, in one direction from a non-white color value to a white value, and goes, for another separation of the given color image, in the same direction from a white value to a non-white color value.