[FIXED] Get hex colors of discrete colorbar

Issue

I have the following colorbar :

from matplotlib import cm

cmap = matplotlib.cm.Blues
bounds = [0, 500, 1000, 1500, 2000, 2500]
norm = matplotlib.colors.BoundaryNorm(bounds, cmap.N , extend = 'max')
plt.colorbar(matplotlib.cm.ScalarMappable(norm=norm, cmap=cmap), orientation='vertical')

Is there a way to get the hex codes of the six colors generated?

Thanks!

Solution

The norm object has a property boundaries - normalise those to the original cmap range, then cmap can convert those to RGBA 4-tuples, and then you can call matplotlib.colors.rgb2hex. Putting it all into a list comprehension gets you:

[matplotlib.colors.rgb2hex(cmap(norm(c))) for c in norm.boundaries]

Result:

['#f7fbff', '#d0e1f2', '#94c4df', '#4a98c9', '#1764ab', '#08306b']

Answered By - Josh Friedlander