认识numpy

1、导入numpy,matplotlib.pyplot模块，并将其别名

import numpy as np
import matplotlib.pyplot as plt

2、读取图片 :imge = plt.imread(‘logo.jpg’)

# 输出结果：
array([[[231, 186, 131],
        [232, 187, 132],
        [233, 188, 133],
        ...,
        [100,  54,  54],
        [ 92,  48,  47],
        [ 85,  43,  44]],

       [[232, 187, 132],
        [232, 187, 132],
        [233, 188, 133],
        ...,
        [100,  54,  54],
        [ 92,  48,  47],
        [ 84,  42,  43]],

       [[232, 187, 132],
        [233, 188, 133],
        [233, 188, 133],
        ...,
        [ 99,  53,  53],
        [ 91,  47,  46],
        [ 83,  41,  42]],

       ...,

       [[199, 119,  82],
        [199, 119,  82],
        [200, 120,  83],
        ...,
        [189,  99,  65],
        [187,  97,  63],
        [187,  97,  63]],

       [[199, 119,  82],
        [199, 119,  82],
        [199, 119,  82],
        ...,
        [188,  98,  64],
        [186,  96,  62],
        [188,  95,  62]],

       [[199, 119,  82],
        [199, 119,  82],
        [199, 119,  82],
        ...,
        [188,  98,  64],
        [188,  95,  62],
        [188,  95,  62]]], dtype=uint8)

3、显示图片：plt.imshow(imge)

4、读取矩阵长度：image.shape

# 输出结果
(920, 1080, 3)

5、随机生成图片并显示

img = np.random.randint(0,255,size=(456,730,3))
img = im.astype(np.float64)
plt.imshow(img)
# 输出结果如下