Colour Science & Perception
what the eye settles, and what it cannot
Generator

ΔE2000 against ΔE76, for pairs near one unit

Each point is one pair of colours whose ΔE2000 is near 1. If the two formulae agreed about ordering the cloud would be a monotone curve; it is a cloud, and every pair of points on opposite sides of the diagonal is a case where the two disagree about which is worse. Measured over 46,020 comparisons at this size, 44 per cent are inverted, and the worst is a pair at ΔE2000 0.75 against 1.25 that ΔE76 puts the other way round. A tolerance written in one of these two formulae is not a tolerance in the other.
ΔE2000 against ΔE76, for pairs near one unit. Each point is one pair of colours whose ΔE2000 is near 1. If the two formulae agreed about ordering the cloud would be a monotone curve; it is a cloud, and every pair of points on opposite sides of the diagonal is a case where the two disagree about which is worse. Measured over 46,020 comparisons at this size, 44 per cent are inverted, and the worst is a pair at ΔE2000 0.75 against 1.25 that ΔE76 puts the other way round. A tolerance written in one of these two formulae is not a tolerance in the other.

Drawn at its defaults, in uniformity, measured. It reads 7 options and no others: show, a, b, band, n, obs, pairs.

Called by 1 essay

the blast radius of changing it

Difference and uniformity

Which of two is worse

Two colour-difference formulae disagree about which of two pairs is the larger difference in thirteen per cent of comparisons overall — and in forty-three per cent of comparisons among pairs sitting near a tolerance of one unit, which is where every acceptance decision is actually made.

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