Python中如何使用NCL的全部色表Colormaps？
cmaps简介Make it easier to use user defined colormaps in matplotlib. Default colormaps are from NCL website.
Users can define a environmental variable CMAP_DIR pointing to the folder containing the self-defined rgb files.
安装 Installation
pip install <a href="https://github.com/hhuangwx/cmaps/archive/master.zip" target="_blank">https://github.com/hhuangwx/cmaps/archive/master.zip</a>or:
git clone <a href="https://github.com/hhuangwx/cmaps.git" target="_blank">https://github.com/hhuangwx/cmaps.git</a>
cd cmaps
python setup.py install
使用 Usage
1import matplotlib.pyplot as plt
2import cmaps
3import numpy as np
4
5x = y = np.arange(-3.0, 3.01, 0.05)
6X, Y = np.meshgrid(x, y)
7
8sigmax = sigmay = 1.0
9mux = muy = sigmaxy=0.0
10
11Xmu = X-mux
12Ymu = Y-muy
13
14rho = sigmaxy/(sigmax*sigmay)
15z = Xmu**2/sigmax**2 + Ymu**2/sigmay**2 - 2*rho*Xmu*Ymu/(sigmax*sigmay)
16denom = 2*np.pi*sigmax*sigmay*np.sqrt(1-rho**2)
17Z = np.exp(-z/(2*(1-rho**2))) / denom
18
19plt.pcolormesh(X,Y,Z,cmap=cmaps.WhiteBlueGreenYellowRed)
20plt.colorbar()
罗列色图
List the colormaps using the code in the examples:1import cmaps
2import numpy as np
3import inspect
4
5import matplotlib.pyplot as plt
6import matplotlib
7matplotlib.rc('text', usetex=False)
8
9
10def list_cmaps():
11 attributes = inspect.getmembers(cmaps, lambda _: not (inspect.isroutine(_)))
12 colors = for _ in attributes if
13 not (_.startswith('__') and _.endswith('__'))]
14 return colors
15
16
17if __name__ == '__main__':
18 color = list_cmaps()
19
20 a = np.outer(np.arange(0, 1, 0.001), np.ones(10))
21 plt.figure(figsize=(20, 20))
22 plt.subplots_adjust(top=0.95, bottom=0.05, left=0.01, right=0.99)
23 ncmaps = len(color)
24 nrows = 8
25 for i, k in enumerate(color):
26 plt.subplot(nrows, ncmaps // nrows + 1, i + 1)
27 plt.axis('off')
28 plt.imshow(a, aspect='auto', cmap=getattr(cmaps, k), origin='lower')
29 plt.title(k, rotation=90, fontsize=10)
30 plt.title(k, fontsize=10)
31 plt.savefig('colormaps.png', dpi=300)
总结
有时候GitHub的下载速度不稳定，建议两种安装方法都尝试一下。
参考
网址1 https://www.ncl.ucar.edu/Document/Graphics/color_table_gallery.shtml
网址2 https://github.com/hhuangwx/cmaps
网址3 http://bbs.06climate.com/forum.php?mod=viewthread&tid=43521
文章来源于微信公众号：气象学家
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