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    rqsd (rq@borg.social)'s status on Saturday, 11-Nov-2023 19:02:16 JSTrqsdrqsd

    FUCK

    I have just wasted an entire fucking hour on a misleading Wikipedia page

    https://en.wikipedia.org/wiki/CIELAB_color_space#From_CIEXYZ_to_CIELAB

    The Xn, Yn and Zn values are for a XYZ reference scale [0, 100]
    However, the formula assumes an XYZ reference scale [0, 1], so the Xn, Yn and Zn values have to be divided by 100 first

    :haggard:

    In conversationabout a year ago from borg.socialpermalink

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      CIELAB color space
      The CIELAB color space, also referred to as L*a*b*, is a color space defined by the International Commission on Illumination (abbreviated CIE) in 1976. It expresses color as three values: L* for perceptual lightness and a* and b* for the four unique colors of human vision: red, green, blue and yellow. CIELAB was intended as a perceptually uniform space, where a given numerical change corresponds to a similar perceived change in color. While the LAB space is not truly perceptually uniform, it nevertheless is useful in industry for detecting small differences in color. Like the CIEXYZ space it derives from, CIELAB color space is a device-independent, "standard observer" model. The colors it defines are not relative to any particular device such as a computer monitor or a printer, but instead relate to the CIE standard observer which is an averaging of the results of color matching experiments under laboratory conditions. Coordinates The CIELAB space is three-dimensional and covers the entire gamut (range...
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