CODEWITHSUNDEEP
pythonmatplotlibcolormap
blupp
blupp

Reputation: 337

Colormap diverging from black instead of white?

I would like a diverging colormap that has another colour than white (preferably black) as it center color. Neither matplotlib or cmocean seems to have such a colormap. Is my best option to create an own colormap, or are there existing ones?

Upvotes: 10

Views: 4654

Answers (2)

Louis-Amand
Louis-Amand

Reputation: 198

If you don't want to use other libraries, you can do something like this:

from matplotlib.colors import LinearSegmentedColormap

color_min    = "#4203ff"
color_center = "black"
color_max    = "#ff0342"
cmap = LinearSegmentedColormap.from_list(
    "cmap_name",
    [color_min, color_center, color_max]
)

Thanks to this user for the answer.

Upvotes: 2

v4hn
v4hn

Reputation: 51

@JohanC put an obvious answer in their comment and I didn't see it because of the accepted answer which requires a less-known package:

Seaborn supports arbitrary diverging palettes with black center

hue_neg, hue_pos = 250, 15
cmap = sns.diverging_palette(hue_neg, hue_pos, center="dark", as_cmap=True)

example above in jupyter

Upvotes: 1

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