4.1 Basics of color

Basics of color

Primary colors of light

• Blue
• Green
• Red

Secondary colors of light

• Magenta(red + blue)
• Yellow(red + green)
• Cyan(green + blue)

Achromatic(무채색) colors of light

• Without color
• The ratio of each color component is same

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Color Models

RGB

• R,G,B-Channel
• When the intensity level of each channel is [0,255]
  

HSI

• Consists Hue(색조),Saturation(채도),Intensity(밝기)-channel
• Intensity(Brightness) : achromatic notion of intensity(large value of I -> bright)
• Hue : the dominant wavelength in a mixture of light waves
• Saturation : the relative purity or the amount of white light mixed(large value of S -> clear)
  
• Intensity value는 세로축의 높이와 비례!
  
  
• Hue value는 intensity value가 정해졌을 때의 높이를 단면으로 잘랐을 때 각도

• Saturation value는 Hue value가 정해졌을 때 거리

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YCbCr

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###Graysacle Image

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Color Processing

##Converting color space into