.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "auto_examples/numpy_operations/plot_camera_numpy.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code or to run this example in your browser via Binder .. rst-class:: sphx-glr-example-title .. _sphx_glr_auto_examples_numpy_operations_plot_camera_numpy.py: Using simple NumPy operations for manipulating images ===================================================== This script illustrates how to use basic NumPy operations, such as slicing, masking and fancy indexing, in order to modify the pixel values of an image. .. GENERATED FROM PYTHON SOURCE LINES 8-30 .. image-sg:: /auto_examples/numpy_operations/images/sphx_glr_plot_camera_numpy_001.png :alt: plot camera numpy :srcset: /auto_examples/numpy_operations/images/sphx_glr_plot_camera_numpy_001.png :class: sphx-glr-single-img .. code-block:: default import numpy as np from skimage import data import matplotlib.pyplot as plt camera = data.camera() camera[:10] = 0 mask = camera < 87 camera[mask] = 255 inds_x = np.arange(len(camera)) inds_y = (4 * inds_x) % len(camera) camera[inds_x, inds_y] = 0 l_x, l_y = camera.shape[0], camera.shape[1] X, Y = np.ogrid[:l_x, :l_y] outer_disk_mask = (X - l_x / 2)**2 + (Y - l_y / 2)**2 > (l_x / 2)**2 camera[outer_disk_mask] = 0 plt.figure(figsize=(4, 4)) plt.imshow(camera, cmap='gray') plt.axis('off') plt.show() .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 0.148 seconds) .. _sphx_glr_download_auto_examples_numpy_operations_plot_camera_numpy.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: binder-badge .. image:: images/binder_badge_logo.svg :target: https://mybinder.org/v2/gh/scikit-image/scikit-image/v0.22.x?filepath=notebooks/auto_examples/numpy_operations/plot_camera_numpy.ipynb :alt: Launch binder :width: 150 px .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: plot_camera_numpy.py ` .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: plot_camera_numpy.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_