Computer displays are made up of individual dots or units called pixels placed in rows and columns, like a chart or grid.  Each pixel can be one of up to 16 millions colors.  Essentially your computer has a Palette that holds a swatch or blob of red paint, green paint, and blue paint.  By mixing these colors together, other colors are created.  Because Red, Green, and Blue are a computer’s primary or fundamental colors, computer displays are said to operate in the RGB (Red, Green, Blue) color space or spectrum.  Each primary color is made up of 256 individual values or shades (measured from 0 – 255.)  By mixing Red at a value of 190, Green at a value of 81, and Blue at a value of 14 for instance, we get a dark orange color.  Mixing all the colors together at a level of 0 produces black.  Red, Green, and Blue all set to a value of 255 produces white.