如何通过matplotlib.pyplot.imshow绘制灰度图像? [英] How to plot gray level image by matplotlib.pyplot.imshow?

问题描述

我的数据是numpy.array格式的2D图像.通过以下代码:

My data is 2D image in format of numpy.array. By the following code:

fig = plt.figure()
ax = fig.add_subplot(111)
ax.imshow(visu_base)
plt.show()

我从Python获得彩色图像.但是，如何显示灰度呢?

I get a color image from Python. But, how can I show it in gray level?

推荐答案

答案在imshow命令[1]

The answer is in the api docs of the imshow command[1]

cmap : Colormap, optional, default: None
    If None, default to rc image.cmap value. cmap is ignored when X has RGB(A) information

imshow 接受一个可选参数 cmap，它控制颜色映射.

imshow takes an optional parameter cmap, which controls the color mapping.

此处可以找到 matplotlib[2] 中定义的可用颜色映射的概述

Here can find an overview of the available color mappings defined in matplotlib[2]

您可以执行以下操作:

import matplotlib as mpl
fig = plt.figure()
ax = fig.add_subplot(111)
ax.imshow(visu_base, cmap=mpl.cm.gray)
plt.show()

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