skimage2.color.xyz2luv#

skimage2.color.xyz2luv(xyz, illuminant='D65', observer='2', *, channel_axis=-1)[source]#

XYZ to CIE-Luv color space conversion.

Parameters:

xyzarray_like of shape (…, C=3, …): The image in XYZ format. By default, the final dimension denotes channels.
illuminant{“A”, “B”, “C”, “D50”, “D55”, “D65”, “D75”, “E”}, optional: The name of the illuminant (the function is NOT case sensitive).
observer{“2”, “10”, “R”}, optional: The aperture angle of the observer.
channel_axisint, optional: This parameter indicates which axis of the array corresponds to channels.

Added in version 0.19: channel_axis was added in 0.19.

Returns:

outndarray of shape (…, C=3, …): The image in CIE-Luv format. Same dimensions as input.

Raises:

ValueError: If xyz is not at least 2-D with shape (…, C=3, …).
ValueError: If either the illuminant or the observer angle are not supported or unknown.

Notes

By default XYZ conversion weights use observer=2A. Reference whitepoint for D65 Illuminant, with XYZ tristimulus values of (95.047, 100., 108.883). See function xyz_tristimulus_values() for a list of supported illuminants.

References

[1]

http://www.easyrgb.com/en/math.php

[2]

https://en.wikipedia.org/wiki/CIELUV

Examples

>>> from _skimage2 import data
>>> from _skimage2.color import rgb2xyz, xyz2luv
>>> img = data.astronaut()
>>> img_xyz = rgb2xyz(img)
>>> img_luv = xyz2luv(img_xyz)