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Title: ENH: add to_grayscale() method to color maps by jakevdp · Pull Request #3589 · matplotlib/matplotlib · GitHub

Open Graph Title: ENH: add to_grayscale() method to color maps by jakevdp · Pull Request #3589 · matplotlib/matplotlib

X Title: ENH: add to_grayscale() method to color maps by jakevdp · Pull Request #3589 · matplotlib/matplotlib

Description: This PR adds a method to the Colormap base class which computes and returns a grayscale version of the map. This helps to quickly preview how various colormaps will appear when printed in grayscale. This uses the same formula as photoshop's grayscale conversion; see http://alienryderflex.com/hsp.html for details. As an example of the usage, we can quickly demonstrate one reason why everybody loves to rag on jet: plt.figure(figsize=(8, 3)) im = np.random.rand(10, 10) plt.subplot(121) plt.imshow(im, cmap=plt.cm.jet) plt.colorbar() plt.subplot(122) plt.imshow(im, cmap=plt.cm.jet.to_grayscale()) plt.colorbar() I'm open to any suggestions or comments! I'm not sure if there are any complications with corner cases that I might be overlooking...

Open Graph Description: This PR adds a method to the Colormap base class which computes and returns a grayscale version of the map. This helps to quickly preview how various colormaps will appear when printed in grayscale...

X Description: This PR adds a method to the Colormap base class which computes and returns a grayscale version of the map. This helps to quickly preview how various colormaps will appear when printed in grayscale...

Opengraph URL: https://github.com/matplotlib/matplotlib/pull/3589

X: @github

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930ab63 ENH: add to_grayscale() method to color maps Sep 29, 2014 https://github.com/matplotlib/matplotlib/pull/3589/commits/930ab6395b002bce137f0a84ee80f8692319d215
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