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

The worst triple found, under ΔE2000

Three colours, plotted on the a*–b* plane of CIELAB. Going from a to c directly is 123.645; going via b is 60.528, which is 51.0 per cent shorter. A distance cannot behave that way, and this one is the formula every colour tolerance in industry is written in. The colours are far apart, which is where the violation is largest; the same search confined to tolerance scale finds a smaller one that has not gone away.
The worst triple found, under ΔE2000. Three colours, plotted on the a–b plane of CIELAB. Going from a to c directly is 123.645; going via b is 60.528, which is 51.0 per cent shorter. A distance cannot behave that way, and this one is the formula every colour tolerance in industry is written in. The colours are far apart, which is where the violation is largest; the same search confined to tolerance scale finds a smaller one that has not gone away.

Drawn at its defaults, in uniformity, measured. It reads 5 options and no others: show, which, obs, tolerance, kL.

Called by 1 essay

the blast radius of changing it

Difference and uniformity

A difference is not a distance

Two earlier essays here said that CIEDE2000 violates the triangle inequality and left it at that. Searching for the violation finds a detour half the length of the direct route, a smaller one inside a five-unit ball, and a second defect nobody mentions — ΔE94 is not even symmetric.

All 155 generators · what each essay asks for instead