plotCIE1931xy_2.py

import itertools
import numpy as np
import matplotlib.pyplot as plt
import colour 
from colour.plotting import *

#RGBを0.0~0.1の間隔で分割し、組み合わせを列挙
line = np.linspace(0.0, 1.0, 15, endpoint=True)
rgb = np.array(list(itertools.product(line,line,line)), dtype=np.float)

#sRGBからXYZへ変換
XYZ = colour.sRGB_to_XYZ(rgb)

#XYZからxyへ変換
xy = colour.XYZ_to_xy(XYZ)

CIE_1931_chromaticity_diagram_plot(bounding_box=(-0.1, 0.9, -0.1, 0.9), standalone=False)

#sRGB領域へプロット
plt.plot(xy[:,0], xy[:,1], 'o', markersize=2, label="sRGB")
plt.legend() 

display(standalone=True)