我想写一个处理图像的网络。为此我需要将rgb转换为Lab，使用它并转换回来：Lab to rgb。起初我想测试它是如何工作的：
from skimage import io, color
rgb = io.imread(filename)
lab = color.rgb2lab(rgb)
rgb2 = color.lab2rgb(lab)
我发现rgb2的所有组件都不对应于rgb：
In [5]: arr_rgb
Out[5]:
array([[[ 2.34194446e-17, 3.92156863e-03, 0.00000000e+00],
[ 7.84313725e-03, 1.56862745e-02, 1.17647059e-02],
[ 1.96078431e-02, 2.74509804e-02, 2.35294118e-02],
...,
[ 1.09803922e-01, 1.68627451e-01, 1.56862745e-01],
[ 1.45098039e-01, 2.03921569e-01, 1.92156863e-01],
[ 1.37254902e-01, 1.96078431e-01, 1.84313725e-01]]
In [6]: image
Out[6]:
array([[[ 0, 1, 0],
[ 2, 4, 3],
[ 5, 7, 6],
...,
[ 28, 43, 40],
[ 37, 52, 49],
[ 35, 50, 47]],