colour.models.cie_ucs Module¶

CIE UCS Colourspace¶

Defines the CIE UCS colourspace transformations:

References

 [1] Wikipedia. (n.d.). CIE 1960 color space. Retrieved February 24, 2014, from http://en.wikipedia.org/wiki/CIE_1960_color_space
 [2] Wikipedia. (n.d.). Relation to CIE XYZ. Retrieved February 24, 2014, from http://en.wikipedia.org/wiki/CIE_1960_color_space#Relation_to_CIE_XYZ
colour.models.cie_ucs.XYZ_to_UCS(XYZ)[source]

Converts from CIE XYZ colourspace to CIE UCS colourspace.

Parameters: XYZ (array_like, (3,)) – CIE XYZ colourspace matrix. CIE UCS colourspace matrix. ndarray, (3,)

Notes

• Input CIE XYZ colourspace matrix is in domain [0, 1].
• Output CIE UCS colourspace matrix is in domain [0, 1].

Examples

>>> XYZ = np.array([0.07049534, 0.1008, 0.09558313])
>>> XYZ_to_UCS(XYZ)
array([ 0.0469968...,  0.1008    ,  0.1637439...])

colour.models.cie_ucs.UCS_to_XYZ(UVW)[source]

Converts from CIE UCS colourspace to CIE XYZ colourspace.

Parameters: UVW (array_like, (3,)) – CIE UCS colourspace matrix. CIE XYZ colourspace matrix. ndarray, (3,)

Notes

• Input CIE UCS colourspace matrix is in domain [0, 1].
• Output CIE XYZ colourspace matrix is in domain [0, 1].

Examples

>>> UVW = np.array([0.04699689, 0.1008, 0.1637439])
>>> UCS_to_XYZ(UVW)
array([ 0.0704953...,  0.1008    ,  0.0955831...])

colour.models.cie_ucs.UCS_to_uv(UVW)[source]

Returns the uv chromaticity coordinates from given CIE UCS colourspace matrix.

Parameters: UVW (array_like, (3,)) – CIE UCS colourspace matrix. uv chromaticity coordinates. tuple

Notes

• Input CIE UCS colourspace matrix is in domain [0, 1].
• Output uv chromaticity coordinates are in domain [0, 1].

Examples

>>> UCS = np.array([0.04699689, 0.1008, 0.1637439])
>>> UCS_to_uv(UCS)
(0.1508530..., 0.3235531...)

colour.models.cie_ucs.UCS_uv_to_xy(uv)[source]

Returns the xy chromaticity coordinates from given CIE UCS colourspace uv chromaticity coordinates.

Parameters: uv (array_like) – CIE UCS uv chromaticity coordinates. xy chromaticity coordinates. tuple

Notes

• Input uv chromaticity coordinates are in domain [0, 1].
• Output xy chromaticity coordinates are in domain [0, 1].

Examples

>>> uv = (0.15085308732766581, 0.3235531372954405)
>>> UCS_uv_to_xy(uv)
(0.2641477..., 0.3777000...)