[FEATURE]: Spectral Similarity Index should handle colour.MultiSpectralDistributions #1370
Description
Description
Hi all !
Should be an easy fix, just ensure the shapes are correctly broadcasted. Unless this is intended !
Code for Reproduction
import colour
data = {
500: (0.004900, 0.323000, 0.272000),
510: (0.009300, 0.503000, 0.158200),
520: (0.063270, 0.710000, 0.078250),
530: (0.165500, 0.862000, 0.042160),
540: (0.290400, 0.954000, 0.020300),
550: (0.433450, 0.994950, 0.008750),
560: (0.594500, 0.995000, 0.003900),
}
labels = ("x_bar", "y_bar", "z_bar")
msd = colour.MultiSpectralDistributions(data, labels=labels)
colour.spectral_similarity_index(msd, msd)Exception Message
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
Cell In[13], line 17
13 labels = ("x_bar", "y_bar", "z_bar")
15 msd = colour.MultiSpectralDistributions(data, labels=labels)
---> 17 colour.spectral_similarity_index(msd, msd)
File ~/Y/X/.venv/lib/python3.14/site-packages/colour/quality/ssi.py:117, in spectral_similarity_index(sd_test, sd_reference, round_result)
114 reference_i = sdiv(reference_i, np.sum(reference_i))
115 dr_i = sdiv(test_i - reference_i, reference_i + 1 / 30)
--> 117 wdr_i = dr_i * [
118 4 / 15,
119 22 / 45,
120 32 / 45,
121 40 / 45,
122 44 / 45,
123 1,
124 1,
125 1,
126 1,
127 1,
128 1,
129 1,
130 1,
131 1,
132 1,
133 1,
134 1,
135 1,
136 1,
137 1,
138 1,
139 1,
140 1,
141 1,
142 1,
143 1,
144 1,
145 1,
146 11 / 15,
147 3 / 15,
148 ]
149 c_wdr_i = convolve1d(wdr_i, [0.22, 0.56, 0.22], mode="constant", cval=0)
150 m_v = np.sum(c_wdr_i**2)
ValueError: operands could not be broadcast together with shapes (30,3) (30,)Environment Information
===============================================================================
* *
* Interpreter : *
* python : 3.14.0 (main, Oct 10 2025, 12:47:49) [Clang 20.1.4 ] *
* *
* colour-science.org : *
* colour : 0.4.6 *
* *
* Runtime : *
* imageio : 2.37.0 *
* matplotlib : 3.10.7 *
* networkx : 3.5 *
* numpy : 2.3.3 *
* scipy : 1.16.2 *
* *
===============================================================================