RGB is a color space for screen colors. The colors on your monitor are put together by the components R=red, G=green and B=blue. An RGB color value consists of three values between 0 and 255 which are often specified as hexadecimals between 00 and FF. The higher the value, the stronger the color - white has the value #FFFFFF or (255,255,255) and black has the value #000000 (0,0,0).