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Asked: 2026-06-17T06:21:36+00:00

Matplotlib only defines below basic colors: •b: blue •g: green •r: red •c: cyan

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Matplotlib only defines below basic colors: 

•b: blue
•g: green
•r: red
•c: cyan
•m: magenta
•y: yellow
•k: black
•w: white

And I want to define more custom color letters, such as

mc1 = RGB(164,106,228)
mc2 = RGB(220,170,114)
mc3 = RGB(249,85,132)

then I can define 

my_color_list = ['g','r','y','b','c','m','k', 'mc1','mc2','mc3']

Then my_color_list can be use for below demo:

import matplotlib.pyplot as plt
dt = [1,2,3,4,5,6,7,8,9]
my_color_list = ['g','r','y','b','c','m','k', 'mc1','mc2','mc3'] # not valid 
bar(range(len(dt)),dt,color=my_color_list)
plt.show()

So how to define customize color letter in matplotlib ? Or, if I have a list of RGB tuple, how to combine RGB tuple together with basic color letters and assign to ‘color’ parameter of ‘plot’/’bar’ command ?

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1 Answer

  1. Editorial Team

    matplotlib supports many ways to specify the color. In addition to the basic colors, you can use CSS color hex codes, Web color names and RGB values.

    • Hex code: a Python string, e.g. '#d2691e'.
    • Web color name: a Python string, e.g. 'chocolate'.
    • RGB values: a Python tuple, in the order of RGB: (0.824, 0.412, 0.118). The components should be normalized to fall within [0, 1].
    • Greyscale: a Python string giving the greyscale, e.g. '0.7'.

    Whenever a color is expected, these forms can be used just like the standard one-letter color names.

    See: http://matplotlib.org/api/colors_api.html

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