python怎么读取图片？

from PIL import Image
import numpy as np
 
I = Image.open('./cc_1.png') 
I.show()    
I.save('./save.png')
I_array = np.array(I)
print I_array.shape

import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import numpy as np
I = mpimg.imread('./cc_1.png')
print I.shape
plt.imshow(I)

import cv2
I = cv2.imread('./cc_1.png')
print I.shape

import matplotlib.pyplot as plt
from scipy import misc
import scipy
I = misc.imread('./cc_1.png')
scipy.misc.imsave('./save1.png', I)
plt.imshow(I)
plt.show()

from skimage import io,data
img=data.lena()
io.imshow(img)