• The RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. 
                                                            
  • When highest intensity of each color is mixed together, white light is created.
                

  • When zero intensity of each color is mixed together, black color is created.
  • The main purpose of the RGB is for the sensing, representation, and display of images in electronic systems, such as TVs, computers.
                                   Image result for rgb in tv    
  • RGB is a device dependent color model, different devices reproduce given RGB value differently, since the color elements and their response to the individual R, G, B vary from manufacturer to manufacturer.
  • The choice of primary colors is related to the physiology of the human eye, primaries are stimuli that maximize the difference between the responses of the cone cells of the human retina to light of different wavelengths and that make a large color triangle. 
                                       
  • The three kinds of light sensitive photoreceptor cells in the human eye respond most to yellow(long wavelength), green(medium wavelength), violet(short wavelength) light. The difference in the signals received from the three kinds allow the brain to differentiate a wide gamut of different colors. 
  • Typical RGB input devices are color TV and video cameras, image scanners, and digital cameras. 
  • Typical RGB output devices
  • CRT screens
  •  OLED screens         Image result for crt screens
Image result for oled screens