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11 Color and Perception

Physical Basis of Colors#

Spectral Power Distribution (SPD)#

谱功率密度

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Note

SPD 具有线性性质

Biological Basis of Colors#

  • retinal photoreceptor cells
    • rods 棒状细胞,感知光强
    • cones 锥形细胞,感知颜色,分为 S M L 三类,感知不同的波长

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Note

\(S,M,L\) 是三种锥形细胞的输出量

Metamers#

同色异谱,光谱不同,但是积分相同,the theory behind color matching

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Color Matching#

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Color Spaces#

  • Standardized RGB (sRGB)
  • XYZ a universal color space
    • 只是匹配函数不同

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  • HSV
    • hue(色调), saturation(饱和度), value(亮度)
  • LAB Space
  • CMYK

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