cImage python模块

Question

我正在编写一个函数来将图像转换并显示为负片，当我调用该函数时，我收到以下错误消息：

Traceback (most recent call last):
File "C:/Users/User/PycharmProjects/Librophyton/Procdeimagenes/test.py",line 32, in <module>
makeNegative(dude)
File "C:\Python34\lib\ImageProcess.py", line 16, in makeNegative
old = FileImage(imageFile)
File "C:\Python34\lib\cImage.py", line 398, in __init__
super(FileImage, self).__init__(fname = thefile)
File "C:\Python34\lib\cImage.py", line 241, in __init__
self.loadImage(fname)
File "C:\Python34\lib\cImage.py", line 270, in loadTkImage
sufstart = fname.rfind('.')
AttributeError: 'FileImage' object has no attribute 'rfind'

函数如下：

^{pr2}$

这是函数调用：

dude = FileImage("factores_de_conversion.gif" )
makeNegative(dude)

你知道怎么解决这个问题吗？或者我应该如何修改模块？在