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matplotlib colormap transparent white to black

c_white = matplotlib.colors.colorConverter.to_rgba('white',alpha = 0)
            c_black= matplotlib.colors.colorConverter.to_rgba('black',alpha = 1)
            cmap_rb = matplotlib.colors.LinearSegmentedColormap.from_list('rb_cmap',[c_white,c_black],512)
            
            
            pl = plt.pcolor(mp1,cmap=cmap_rb)

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matplotlib colormap transparent white to black

from matplotlib.colors import ListedColormap

cmap = np.zeros([256, 4])
cmap[:, 3] = np.linspace(0, 1, 256)
cmap = ListedColormap(cmap)

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matplotlib colormap transparent white to black

matplotlib colormap transparent white to black

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