An image-map specification allows you to map the colors of an image region by listing color number/color value pairs. The image map tells ESL how to color an image. Different software produces different color schemes so that a red object in the original image might be displayed as blue in ESL. ESL supports 16 colors, and because some software can support more, undesirable results can occur as different colors in the original are mapped to the same color in ESL. The color map will override any foreground or background color specified for the region.