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Tristimulus Colorimetry - Coggle Diagram

- - - - The CIE used the data produced by Wright and Guild to develope the CIE Color System or CIE XYZ color space
      - The CIE XYZ used the values of X, Y and Z and was designed so that the value of Y was a measurement of the brightness of a color.
        The values of X, Y and Z were used to derive the parameters of x and y to be able to plot the colors on the CIE gamut chart
      - The CIE XYZ color space is only one model and special for 2 reasons
        
        It was based on direct measurements of the human eye, specifically the three cone cell receptors
        
        It is the basis and gold standard which is used to describe many other systems
    - - This set of colour-matching functions is representative of the colour-matching properties of observers with
        normal colour vision for visual field sizes of angular subtense greater than about 4°
    - - chromaticity from coordinates (x, y, z) to
        the UCS coordinates (u,v,w`)
      - u’,v’ is used to evaluate the size and shape of Standard Deviation Color Matching (SDCM) steps at any color point
      - revised color space was scaled to provide more uniform spacing for colors at approximately the same luminance.