在Python中调整图像大小

Question

我使用this question的代码将一些原始图像转换为png。

import matplotlib.pyplot as plt 
import numpy as np 

# Parameters. 
input_filename = "JPCLN001.IMG" 
shape = (2048, 2048) # matrix size 
dtype = np.dtype('>u2') # big-endian unsigned integer (16bit) 
output_filename = "JPCLN001.PNG" 

# Reading. 
fid = open(input_filename, 'rb') 
data = np.fromfile(fid, dtype) 
image = data.reshape(shape) 

# Display. 
plt.imshow(image, cmap = "gray") 
plt.savefig(output_filename) 
plt.show() 

事情是，我期待一个2048x2048的PNG大小，但我得到的是500x500下的图像。有关如何解决这个问题的任何建议？

Answer 1

如果你只是想将数组作为.png保存而不绘制它，你可以使用matplotlib.image.imsave：

import numpy as np 
from matplotlib import pyplot as plt 

# some random data 
img = np.random.randint(256, size=(2048, 2048)) 

# creates a 2048 x 2048 .png image 
plt.imsave('img.png', img, cmap='gray')