Color and Gray scale Color index value(cont. Color code into a table(color lookup table or color map) o Tokeep the index value referencing the color-table entries into each pixel ocation Lookup Table To Red Gun e To Blue Gun 1962081 0000000010000010001 Only Megabyte for he frame buffe (ze:1024x1024) A color lookup table with 24 bits per entry that is accessed from a frame buffer with 8 bits per pixel. A value of 196 stored at pixel position (r, y) references the location in this table containing the hexadecimal value Ox0821(a decimal value of 2081) Each 8-bit segment of this entry controls the intensity level of one of the three electron an RGB Computer Graphics with Open GL, Third Edition, by Donald Hearn and M. Pauline Baker ISBN0-13-0-15390-70 2004 Pearson Education, Inc, Upper Saddle River, NJ. All rights reservedColor and Gray Scale  Color index value (cont.)  Color code into a table (color lookup table or color map)  To keep the index value referencing the color-table entries into each pixel location Only1megabyte for the frame buffer (size: 1024X1024) Figure 5-1 13