.. _pylab_examples-shading_example:

pylab_examples example code: shading_example.py
===============================================



.. plot:: /media/TOSHI/temp/numpy_scipy_matplotlib/matplotlib/matplotlib-1.1.1~rc2/doc/mpl_examples/pylab_examples/shading_example.py

::

    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib.colors import LightSource
    
    # example showing how to make shaded relief plots
    # like mathematica
    # (http://reference.wolfram.com/mathematica/ref/ReliefPlot.html)
    # or Generic Mapping Tools
    # (http://gmt.soest.hawaii.edu/gmt/doc/gmt/html/GMT_Docs/node145.html)
    
    # test data
    X,Y=np.mgrid[-5:5:0.05,-5:5:0.05]
    Z=np.sqrt(X**2+Y**2)+np.sin(X**2+Y**2)
    # create light source object.
    ls = LightSource(azdeg=0,altdeg=65)
    # shade data, creating an rgb array.
    rgb = ls.shade(Z,plt.cm.copper)
    # plot un-shaded and shaded images.
    plt.figure(figsize=(12,5))
    plt.subplot(121)
    plt.imshow(Z,cmap=plt.cm.copper)
    plt.title('imshow')
    plt.xticks([]); plt.yticks([])
    plt.subplot(122)
    plt.imshow(rgb)
    plt.title('imshow with shading')
    plt.xticks([]); plt.yticks([])
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)