"colour.dominant_wavelength" definition seems to struggle with precise spectral locus CMF xy values?
See original GitHub issueCMFS_1931 = colour.MSDS_CMFS["CIE 1931 2 Degree Standard Observer"]
CMFS_1931_xy = colour.XYZ_to_xy(CMFS_1931.values)
whitepoint = numpy.asarray([0.3101, 0.3163])
discard, locus_1931_samples_xy, discard = \
colour.dominant_wavelength(
CMFS_1931_xy,
whitepoint,
cmfs=CMFS_1931,
)
/usr/local/lib/python3.7/dist-packages/colour/algebra/geometry.py:326: RuntimeWarning: invalid value encountered in true_divide
u_a = numerator_a / denominator
/usr/local/lib/python3.7/dist-packages/colour/algebra/geometry.py:327: RuntimeWarning: divide by zero encountered in true_divide
u_b = numerator_b / denominator
/usr/local/lib/python3.7/dist-packages/colour/algebra/geometry.py:327: RuntimeWarning: invalid value encountered in true_divide
u_b = numerator_b / denominator
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-40-2288142fce39> in <module>()
10 CMFS_1931_xy,
11 whitepoint,
---> 12 cmfs=CMFS_1931,
14 )
3 frames
/usr/local/lib/python3.7/dist-packages/colour/colorimetry/dominant.py in dominant_wavelength(xy, xy_n, cmfs, inverse)
194 xy_s = XYZ_to_xy(cmfs.values)
195
--> 196 i_wl, xy_wl = closest_spectral_locus_wavelength(xy, xy_n, xy_s, inverse)
197 xy_cwl = xy_wl
198 wl = cmfs.wavelengths[i_wl]
/usr/local/lib/python3.7/dist-packages/colour/colorimetry/dominant.py in closest_spectral_locus_wavelength(xy, xy_n, xy_s, inverse)
117 i_wl = np.argmin(scipy.spatial.distance.cdist(xy_wl, xy_s), axis=-1)
118
--> 119 i_wl = np.reshape(i_wl, xy.shape[0:-1])
120 xy_wl = np.reshape(xy_wl, xy.shape)
121
<__array_function__ internals> in reshape(*args, **kwargs)
/usr/local/lib/python3.7/dist-packages/numpy/core/fromnumeric.py in reshape(a, newshape, order)
297 [5, 6]])
298 """
--> 299 return _wrapfunc(a, 'reshape', newshape, order=order)
300
301
/usr/local/lib/python3.7/dist-packages/numpy/core/fromnumeric.py in _wrapfunc(obj, method, *args, **kwds)
56
57 try:
---> 58 return bound(*args, **kwds)
59 except TypeError:
60 # A TypeError occurs if the object does have such a method in its
ValueError: cannot reshape array of size 6225 into shape (471,)
Issue Analytics
- State:
- Created 2 years ago
- Comments:18 (18 by maintainers)
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Nah, one liner change.
I arrived at one via Shapely. Not sure if it is relevant or if it could be viable for Colour, but it seems to work pretty well. Essentially create a Shapely polygon from the CMFS, then use the intersection to calculate.