Glossary for Geospatial Science

color map or color table:� A color map is the table, or map, used by a computer system to assign display colors to digital values.� A color map for an 8-bit raster object can contain a total of 256 colors.� A gray scale image may have a color map with 256 shades of gray, ranging from black (0) to white (255).� The first 64 places in a color map are normally assigned to the �standard 64� annotation colors.� Additionally, certain processes may use 16 values for standard shades of gray.� The remaining 176 or 192 colors are then available for the image colors used in the display.� Some types of color maps that you will encounter in TNTmips are optimized color maps and composite color maps.