Colour Difference

Delta E

colour

delta_E(a, b[, method])

Returns the difference \(\Delta E_{ab}\) between two given CIE L*a*b* or \(J'a'b'\) colourspace arrays using given method.

DELTA_E_METHODS

Supported \(\Delta E_{ab}\) computation methods.

CIE 1976

colour.difference

JND_CIE1976

Just Noticeable Difference (JND) according to CIE 1976 colour difference formula, i.e. Euclidean distance in CIE L*a*b* colourspace.

delta_E_CIE1976(Lab_1, Lab_2)

Returns the difference \(\Delta E_{76}\) between two given CIE L*a*b* colourspace arrays using CIE 1976 recommendation.

CIE 1994

colour.difference

delta_E_CIE1994(Lab_1, Lab_2[, textiles])

Returns the difference \(\Delta E_{94}\) between two given CIE L*a*b* colourspace arrays using CIE 1994 recommendation.

CIE 2000

colour.difference

delta_E_CIE2000(Lab_1, Lab_2[, textiles])

Returns the difference \(\Delta E_{00}\) between two given CIE L*a*b* colourspace arrays using CIE 2000 recommendation.

CMC

colour.difference

delta_E_CMC(Lab_1, Lab_2[, l, c])

Returns the difference \(\Delta E_{CMC}\) between two given CIE L*a*b* colourspace arrays using Colour Measurement Committee recommendation.

Luo, Cui and Li (2006)

colour.difference

delta_E_CAM02LCD(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Luo et al.

delta_E_CAM02SCD(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Luo et al.

delta_E_CAM02UCS(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Luo et al.

Li, Li, Wang, Zu, Luo, Cui, Melgosa, Brill and Pointer (2017)

colour.difference

delta_E_CAM16LCD(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Li et al.

delta_E_CAM16SCD(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Li et al.

delta_E_CAM16UCS(Jpapbp_1, Jpapbp_2)

Returns the difference \(\Delta E'\) between two given *Li et al.

DIN99

colour.difference

delta_E_DIN99(Lab_1, Lab_2[, textiles])

Returns the difference \(\Delta E_{DIN99}\) between two given CIE L*a*b* colourspace arrays using DIN99 formula.