Colour Appearance Models#

ATD (1995)#

colour

`XYZ_to_ATD95`(XYZ, XYZ_0, Y_0, k_1, k_2[, sigma])	Compute the ATD (1995) colour vision model correlates.
`CAM_Specification_ATD95`(h, C, Q, A_1, T_1, ...)	Define the ATD (1995) colour vision model specification.

CIECAM02#

colour

`XYZ_to_CIECAM02`(XYZ, XYZ_w, L_A, Y_b[, ...])	Compute the CIECAM02 colour appearance model correlates from given CIE XYZ tristimulus values.
`CIECAM02_to_XYZ`(specification, XYZ_w, L_A, Y_b)	Convert from CIECAM02 specification to CIE XYZ tristimulus values.
`CAM_Specification_CIECAM02`(J, C, h, s, Q, M, ...)	Define the CIECAM02 colour appearance model specification.
`VIEWING_CONDITIONS_CIECAM02`	Reference CIECAM02 colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

`CAM_KWARGS_CIECAM02_sRGB`	Default parameter values for the CIECAM02 colour appearance model usage in the context of sRGB.
`InductionFactors_CIECAM02`(F, c, N_c)	CIECAM02 colour appearance model induction factors.

CIECAM16#

colour

`XYZ_to_CIECAM16`(XYZ, XYZ_w, L_A, Y_b[, ...])	Compute the CIECAM16 colour appearance model correlates from given CIE XYZ tristimulus values.
`CIECAM16_to_XYZ`(specification, XYZ_w, L_A, Y_b)	Convert from CIECAM16 specification to CIE XYZ tristimulus values.
`CAM_Specification_CIECAM16`(J, C, h, s, Q, M, ...)	Define the CIECAM16 colour appearance model specification.
`VIEWING_CONDITIONS_CIECAM16`	Reference CIECAM16 colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

InductionFactors_CIECAM16(F, c, N_c)

CIECAM16 colour appearance model induction factors.

CAM16#

colour

`XYZ_to_CAM16`(XYZ, XYZ_w, L_A, Y_b[, ...])	Compute the CAM16 colour appearance model correlates from given CIE XYZ tristimulus values.
`CAM16_to_XYZ`(specification, XYZ_w, L_A, Y_b)	Convert from CAM16 specification to CIE XYZ tristimulus values.
`CAM_Specification_CAM16`(J, C, h, s, Q, M, H, HC)	Define the CAM16 colour appearance model specification.
`VIEWING_CONDITIONS_CAM16`	Reference CAM16 colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

InductionFactors_CAM16(F, c, N_c)

CAM16 colour appearance model induction factors.

Hellwig and Fairchild (2022) Colour Appearance Model#

colour

`XYZ_to_Hellwig2022`(XYZ, XYZ_w, L_A, Y_b[, ...])	Compute the Hellwig and Fairchild (2022) colour appearance model correlates from given CIE XYZ tristimulus values.
`Hellwig2022_to_XYZ`(specification, XYZ_w, ...)	Convert from Hellwig and Fairchild (2022) specification to CIE XYZ tristimulus values.
`CAM_Specification_Hellwig2022`(J, C, h, s, Q, ...)	Define the Hellwig and Fairchild (2022) colour appearance model specification.
`VIEWING_CONDITIONS_HELLWIG2022`	Reference Hellwig and Fairchild (2022) colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

InductionFactors_Hellwig2022(F, c, N_c)

Hellwig and Fairchild (2022) colour appearance model induction factors.

Hunt#

colour

`XYZ_to_Hunt`(XYZ, XYZ_w, XYZ_b, L_A[, ...])	Compute the Hunt colour appearance model correlates.
`CAM_Specification_Hunt`(J, C, h, s, Q, M, H, HC)	Define the Hunt colour appearance model specification.
`VIEWING_CONDITIONS_HUNT`	Reference Hunt colour appearance model viewing conditions.

Kim, Weyrich and Kautz (2009)#

colour

`XYZ_to_Kim2009`(XYZ, XYZ_w, L_A[, media, ...])	Compute the Kim, Weyrich and Kautz (2009) colour appearance model correlates from given CIE XYZ tristimulus values.
`Kim2009_to_XYZ`(specification, XYZ_w, L_A[, ...])	Convert from Kim, Weyrich and Kautz (2009) specification to CIE XYZ tristimulus values.
`CAM_Specification_Kim2009`(J, C, h, s, Q, M, ...)	Define the Kim, Weyrich and Kautz (2009) colour appearance model specification.
`MEDIA_PARAMETERS_KIM2009`	Reference Kim, Weyrich and Kautz (2009) colour appearance model media parameters.
`VIEWING_CONDITIONS_KIM2009`	Reference Kim, Weyrich and Kautz (2009) colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

`InductionFactors_Kim2009`(F, c, N_c)	Kim, Weyrich and Kautz (2009) colour appearance model induction factors.
`MediaParameters_Kim2009`(E)	Kim, Weyrich and Kautz (2009) colour appearance model media parameters.

\(LLAB(l:c)\)#

colour

`XYZ_to_LLAB`(XYZ, XYZ_0, Y_b, L[, surround])	Compute the :math:`LLAB(l:c)` colour appearance model correlates.
`CAM_Specification_LLAB`(J, ...)	Define the :math:`LLAB(l:c)` colour appearance model specification.
`VIEWING_CONDITIONS_LLAB`	Reference \(LLAB(l:c)\) colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

InductionFactors_LLAB(D, F_S, F_L, F_C)

:math:`LLAB(l:c)` colour appearance model induction factors.

Nayatani (1995)#

colour

`XYZ_to_Nayatani95`(XYZ, XYZ_n, Y_o, E_o, E_or)	Compute the Nayatani (1995) colour appearance model correlates.
`CAM_Specification_Nayatani95`(L_star_P, C, h, ...)	Define the Nayatani (1995) colour appearance model specification.

RLAB#

colour

`XYZ_to_RLAB`(XYZ, XYZ_n, Y_n[, sigma, D])	Compute the RLAB model color appearance correlates.
`CAM_Specification_RLAB`(J, C, h, s, HC, a, b)	Define the RLAB colour appearance model specification.
`VIEWING_CONDITIONS_RLAB`	Reference RLAB colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

D_FACTOR_RLAB

RLAB colour appearance model Discounting-the-Illuminant factor values.

ZCAM#

colour

`XYZ_to_ZCAM`(XYZ, XYZ_w, L_A, Y_b[, ...])	Compute the ZCAM colour appearance model correlates from given CIE XYZ tristimulus values.
`ZCAM_to_XYZ`(specification, XYZ_w, L_A, Y_b)	Convert from ZCAM specification to CIE XYZ tristimulus values.
`CAM_Specification_ZCAM`(J, C, h, s, Q, M, H, ...)	Define the ZCAM colour appearance model specification.
`VIEWING_CONDITIONS_ZCAM`	Reference ZCAM colour appearance model viewing conditions.

Ancillary Objects

colour.appearance

InductionFactors_ZCAM(F_s, F, c, N_c)

ZCAM colour appearance model induction factors.

Helmholtz-Kohlrausch Effect Estimation#

colour

`HKE_NAYATANI1997_METHODS`	Nayatani (1997) HKE computation methods, choice between variable achromatic colour ('VAC') and variable chromatic colour ('VCC')
`HelmholtzKohlrausch_effect_object_Nayatani1997`(uv, ...)	Return the HKE value for object colours using Nayatani (1997) method.
`HelmholtzKohlrausch_effect_luminous_Nayatani1997`(uv, ...)	Return the HKE factor for luminous colours using Nayatani (1997) method.

Ancillary Objects

colour.appearance

`coefficient_q_Nayatani1997`(theta)	Return the \(q(\theta)\) coefficient for Nayatani (1997) HKE computations.
`coefficient_K_Br_Nayatani1997`(L_a)	Return the \(K_{Br}\) coefficient for Nayatani (1997) HKE computations.