lab2lch
-
skimage.color.lab2lch(lab)
[source] -
CIE-LAB to CIE-LCH color space conversion.
LCH is the cylindrical representation of the LAB (Cartesian) colorspace
Parameters: lab : array_like
The N-D image in CIE-LAB format. The last (
N+1
-th) dimension must have at least 3 elements, corresponding to theL
,a
, andb
color channels. Subsequent elements are copied.Returns: out : ndarray
The image in LCH format, in a N-D array with same shape as input
lab
.Raises: ValueError
If
lch
does not have at least 3 color channels (i.e. l, a, b).Notes
The Hue is expressed as an angle between
(0, 2*pi)
Examples
>>> from skimage import data >>> from skimage.color import rgb2lab, lab2lch >>> img = data.astronaut() >>> img_lab = rgb2lab(img) >>> img_lch = lab2lch(img_lab)
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