Compare with ‘Hunter Lab’ (1948) — notice that the spelling is Lab. Hunter Lab was designed to be computed via simple formulas from the CIEXYZ space, but to be more perceptually uniform. (wiki) Hunter Lab was a precursor to CIELAB (1976).
Related to: Perceptually Uniform Colour, OKLab colour space
References
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https://en.wikipedia.org/wiki/CIELAB_color_space
- The CIELAB colour space, aka Lab*, is a colour space defined by the International Commission on Illumination (abbreviated CIE) in 1976.
- CIELAB was intended as a perceptually uniform space, where a given numerical change corresponds to a similar perceived change in colour.
- It expresses colour as three values:
L*for perceptual lightness anda*andb*for the four unique colours of human vision: red, green, blue and yellow.