Python：PIL-Module中的Colorbands

Question

我從PIL手冊獲得了這段代碼，但是我收到一條錯誤消息。

from PIL import Image, ImageEnhance, ImageChops 

im = Image.open("D:\\Python26\\PYTHON-PROGRAMME\\bild.jpg") 

# split the image into individual bands 
source = im.split() 

R, G, B = 0, 1, 2 

# select regions where red is less than 100 
mask = source[R].point(lambda i: i < 100 and 255) 

# process the green band 
out = source[G].point(lambda i: i * 0.7) 

# paste the processed band back, but only where red was < 100 
source[G].paste(out, None, mask) 

# build a new multiband image 
im = Image.merge(im.mode, source) 
im = im.point(lambda i: expression and 255) 

im.save("D:\\Python26\\PYTHON-PROGRAMME\\bild2.jpg") 
print('done') 

錯誤：

Traceback (most recent call last): 
    File "D:\Python26\PYTHON-PROGRAMME\00000000000000000", line 14, in <module> 
    out = source[G].point(lambda i: i * 0.7) 
IndexError: tuple index out of range 

Answer 1

代碼運行對我很好，彩色圖像上。

如果您試圖對只有一個顏色通道的圖像進行操作，那麼我希望您能夠得到引用的錯誤 - 即。一個黑白的JPEG。 im= im.convert('RGB')之前split，可以肯定嗎？