Red Green Blue Intensity (RGBI) is the technology used to generate a 16-color image on early digital-input computer monitors. 16-colors are created by the addition of an intensity bit to the digital signals controlling the three primary colors, red, blue, and green. The 16 colors created are black, dark gray, light gray blue, light blue, green, light green, cyan, light cyan, red, light red, purple, light purple, yellow, light yellow and white.