dk.simongray.colour-coded.difference — dk.simongray/colour-coded 0.1.0

How different two colours look, by the measures of colour difference that CSS Color 4 gives, in section 20.

• delta-e, the distance in Oklab, ΔEOK, of which 0.02 is about the least difference that shows
• delta-e-ok2, ΔEOK with a and b doubled, which Ottosson found to fit the data of perceived differences better
• delta-e-76, the distance in CIELAB, CIE76, of which 2.3 is about the least that shows (Sharma and Trussell 1997)
• delta-e-2000, CIEDE2000, the standard of the CIE, of which 1 to 2 is about the least that shows

https://www.w3.org/TR/css-color-4/#color-difference

delta-e clj/s

(delta-e a b)

ΔEOK, the distance of the colours a and b in Oklab, of which 0.02 is about the least that shows.

delta-e-2000 clj/s

(delta-e-2000 a b)

CIEDE2000, the difference of the colours a and b in CIELAB, of which 1 to 2 is about the least that shows.

delta-e-76 clj/s

(delta-e-76 a b)

CIE76, the distance of the colours a and b in CIELAB.

delta-e-ok2 clj/s

(delta-e-ok2 a b)

ΔEOK2, the distance of the colours a and b in Oklab with a and b doubled, of which 0.02 is about the least that shows.

least clj/s

(least xs)

(least xs f)

The least difference between any two colours of xs, by ΔEOK or by the measure f, or nil for fewer than two colours.

nearest clj/s

(nearest x xs)

(nearest x xs f)

The colour of xs nearest to the colour x by ΔEOK, or by the measure f, a function of two colours, e.g. delta-e-2000.