colour.models.rgb.prismatic Module

Prismatic Colourspace

Defines the Prismatic colourspace transformations:

• RGB_to_Prismatic()
• Prismatic_to_RGB()

See also

Prismatic Colourspace Jupyter Notebook

References

[1]	Shirley, P., & Hart, D. (2015). The prismatic color space for rgb computations, 2–7.

colour.models.rgb.prismatic.RGB_to_Prismatic(RGB)

Converts from RGB colourspace to Prismatic \(L\rho\gamma\beta\) colourspace array.

Parameters:RGB (array_like) – RGB colourspace array. Returns:Prismatic \(L\rho\gamma\beta\) colourspace array. Return type:ndarray

Examples

>>> RGB = np.array([0.25, 0.50, 0.75])
>>> RGB_to_Prismatic(RGB)  
array([ 0.75...   ,  0.1666666...,  0.3333333...,  0.5...   ])

Adjusting saturation of given RGB colourspace array: >>> saturation = 0.5 >>> Lrgb = RGB_to_Prismatic(RGB) >>> Lrgb[..., 1:] = 1 / 3 + saturation * (Lrgb[..., 1:] - 1 / 3) >>> Prismatic_to_RGB(Lrgb) # doctest: +ELLIPSIS array([ 0.45..., 0.6..., 0.75...])

colour.models.rgb.prismatic.Prismatic_to_RGB(Lrgb)

Converts from Prismatic \(L\rho\gamma\beta\) colourspace array to RGB colourspace.

Parameters:Lrgb (array_like) – Prismatic \(L\rho\gamma\beta\) colourspace array. Returns:RGB colourspace array. Return type:ndarray

Examples

>>> Lrgb = np.array([0.75000000, 0.16666667, 0.33333333, 0.50000000])
>>> Prismatic_to_RGB(Lrgb)  
array([ 0.25...   ,  0.4999999...,  0.75...  ])