Python圖片轉換成矩陣，矩陣數據轉換成圖片

# coding=gbk
from PIL import Image
import numpy as np
# import scipy
import matplotlib.pyplot as plt

def ImageToMatrix(filename):
    # 讀取圖片
    im = Image.open(filename)
    # 顯示圖片
#     im.show()  
    width,height = im.size
    im = im.convert("L") 
    data = im.getdata()
    data = np.matrix(data,dtype=‘float‘)/255.0
    #new_data = np.reshape(data,(width,height))
    new_data = np.reshape(data,(height,width))
    return new_data
#     new_im = Image.fromarray(new_data)
#     # 顯示圖片
#     new_im.show()
def MatrixToImage(data):
    data = data*255
    new_im = Image.fromarray(data.astype(np.uint8))
    return new_im



filename = ‘lena.jpg‘
data = ImageToMatrix(filename)
print data 
new_im = MatrixToImage(data)
plt.imshow(data, cmap=plt.cm.gray, interpolation=‘nearest‘)
new_im.show()
new_im.save(‘lena_1.bmp‘)

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上面要先對圖片去除顏色，就是變成黑白的，轉換成二維數據矩陣，不去顏色的還要保存顏色的，然後後面轉換就不行了，下面利用Image.fromarray(data) 新建圖片

http://www.cnblogs.com/theskulls/p/4925147.html