Python 使用image.merge合并tif图像

我试图将4个TIF合并在一起以形成CMYK图像

这是我目前掌握的代码：-

import Image

m = "C:\Documents and Settings\dbigwood\Desktop\TEST\magnew.tif"
c = "C:\Documents and Settings\dbigwood\Desktop\TEST\cyannew.tif"
y = "C:\Documents and Settings\dbigwood\Desktop\TEST\yellownew.tif"
k = "C:\Documents and Settings\dbigwood\Desktop\TEST\knew.tif"

im = Image.merge("CMYK",(c,m,y,k))

im.save("C:\Documents and Settings\dbigwood\Desktop\TEST\AAA.tif")

这在运行时给了我一个错误

Traceback (most recent call last):
  File "C:\Documents and Settings\dbigwood\Desktop\TEST\try5.py", line 18, in <module>
    im = Image.merge("CMYK",(c,m,y,k))
  File "C:\Python26\ArcGIS10.0\lib\site-packages\PIL\Image.py", line 1996, in merge
    if im.mode != getmodetype(mode):
AttributeError: 'str' object has no attribute 'mode'

回溯（最近一次呼叫最后一次）：
文件“C:\Documents and Settings\dbigwood\Desktop\TEST\try5.py”，第18行，在
im=Image.merge（“CMYK”，（c，m，y，k））
文件“C:\Python26\ArcGIS10.0\lib\site packages\PIL\Image.py”，第1996行，合并
如果即时通讯模式！=getmodetype（模式）：
AttributeError:“str”对象没有属性“mode”

---

任何想法都会被欣赏

m

，

c

，

y

和

k

需要是

PIL

图像对象，例如

m = Image.open("C:\Documents and Settings\dbigwood\Desktop\TEST\magnew.tif")