There were several permutations of the Hunter L, a, b color scale before the current formulas were released in 1966. The Hunter L, a, b color scale evolved during the 1950s and 1960s when many scientists involved with color measurement were working on uniform color scales. A three-dimensional representation of L, a, b color space is shown below. All three values are required to completely describe an object‘s color. The L value for each scale therefore indicates the level of light or dark, the a value redness or greenness, and the b value yellowness or blueness. blue where a positive number indicates yellow and a negative number indicates blue. green where a positive number indicates red and a negative number indicates green. dark where a low number (0-50) indicates dark and a high number (51-100) indicates light. This theory assumes that the receptors in the human eye perceive color as the following pairs of opposites. Hunter L, a, b and CIE 1976 L*a*b* (CIELAB) are both color scales based on the Opponent-Color Theory. This application note discusses the advantages of each scale so that the user may choose the best one to use.Ĭhallenge: To choose the best color scale for the measurement. The use of these color scales with practice can easily lead to understanding and communication of color values. Both the Hunter L, a, b scale and the CIELAB scales are intuitive.
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