【Python代码】图像的变换

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png"))
print(a.shape, a.dtype)

b = [255, 255, 255]-a
im = Image.fromarray(b.astype('uint8'))
im.save('C:/Users/xpp/Desktop/Lena2.png')

注意：

b = [255, 255, 255]-a
im = Image.fromarray(b.astype('uint8'))
im.save('C:/Users/xpp/Desktop/Lena2.png')

修改为

b = 255 - a
im = Image.fromarray(b.astype('uint8'))
im.save('C:/Users/xpp/Desktop/Lena2.png')

注意：

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png"))
print(a.shape, a.dtype)

修改为

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png").convert('L'))
print(a.shape, a.dtype)

完整代码

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png").convert('L'))
print(a.shape, a.dtype)
b = 255 - a
im = Image.fromarray(b.astype('uint8'))
im.save('C:/Users/xpp/Desktop/Lena2.png')

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png").convert('L'))
c = (100/255)*a+150#区间变换
im = Image.fromarray(c.astype('uint8'))
im.save("C:/Users/xpp/Desktop/Lena2.png")

from PIL import Image
import numpy as np
a = np.array(Image.open("C:/Users/xpp/Desktop/Lena.png").convert('L'))
d = 255 * (a/255)**2#像素平方
im = Image.fromarray(c.astype('uint8'))
im.save("C:/Users/xpp/Desktop/Lena2.png")

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