This article introduces “python How to take it out colomap Part of the color range ” Knowledge about , During the operation of the actual case , Many people will encounter such difficulties , Next, let Xiaobian lead you to learn how to deal with these situations ！ I hope you will read carefully , Be able to learn ！
Usually when we draw a color map , We often use various colormap, however python Some of the colormap Sometimes the color code is not so suitable , We need to cut it for use .
Official website colormap Example links are as follows ：
colormap
This article provides a method , Can be extracted colormap Part of the color code , Take out the color code area we are satisfied with . Let's say jet For example , demonstrate
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable
import numpy as np
from matplotlib.colors import ListedColormap, LinearSegmentedColormap
ax = plt.subplot()
cmap=plt.get_cmap('jet')
newcolors=cmap(np.linspace(0, 1, 256))
newcmap = ListedColormap(newcolors[57:245])
im = ax.imshow(np.arange(100).reshape((10, 10)),cmap=newcmap)
# create an axes on the right side of ax. The width of cax will be 5%
# of ax and the padding between cax and ax will be fixed at 0.05 inch.
divider = make_axes_locatable(ax)
cax = divider.append_axes("right", size="5%", pad=0.05)
plt.colorbar(im, cax=cax)
plt.show()Before change ：
After modification ：
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