如何避免在matplotlib.pyplot imshow()中进行自动伪着色 [英] How to avoid automatic pseudo coloring in matplotlib.pyplot imshow()

问题描述

我有一个要打印为图像的28x28 numpy ndarray.由于它是灰度图片，因此每个像素只有一个颜色值.这些值从-0.5缩放到0.5. 我使用plt.imshow(array).当我这样做时，图像将使用喷射色图而不是灰度打印出来.

I have a 28x28 numpy ndarray that I want to print out as an image. Since it is a grayscale picture, it only has one color value per pixel. These values are scaled from -0.5 to 0.5. I use plt.imshow(array). When I do that, the image gets printed out with the jet colormap, instead of grayscale.

如果我应用cmap ='gray'，我会得到灰度图像，但是为什么默认的imshow()使用喷射色图呢?

If I apply cmap = 'gray' I get my grayscale image, but why is the default imshow() using the jet colormap)?

推荐答案

要防止matplotlib默认使用"jet"颜色映射，您需要修改与matplotlibrc文件中默认cmap对应的行，通常在〜/中找到.config/matplotlib/matplotlibrc:

To prevent matplotlib from using the "jet" colormap as default you need to modify the line corresponding to the default cmap in the matplotlibrc file, usually found in ~/.config/matplotlib/matplotlibrc:

image.cmap   : gray               # gray | jet etc...

此外，我鼓励大家在 matplotlib 2.0

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