The invention relates to a method for determining the color fidelity (ΔE) and / or determining the human perceivable color difference (ΔE) between two colors given by respective color vectors (E1, E2), the two color vectors (E1, E2) relating to a each of the components of the respective color vector (E1, E2) corresponds to the brightness measurement value of a sensor (10, 11) for a given wavelength or a predetermined wavelength range. It is provided that the multiplier (ΔÊ) is determined by predetermining a quantization space (Q) comprising a number of vectors (q), assigning (Z) for each color vector (e) within the color space (R) to any of the vectors (q) in the quantization space (Q), all color vectors (e) of the quantization space (Q) mapped to the same vector (q) are each within a given environment (u), and the Zuo adjacent (Z) adjacent regions (u) of color vectors (e) to adjacent vectors (q) in the quantization space (Q) maps, each vector (q) within the quantization space (Q) is assigned a multiplier value (ΔÊ (q)) , the base color vector (B) is searched for the vector (q) assigned to it by the assignment (Z) and assigned to it as the quantization vector (Q), and the multiplier value (ΔÊ (Q)) assigned to the respective quantization vector (Q) is determined as a multiplier (ΔÊ) is used.
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