我正在尝试裁剪图像，然后将裁剪后的图像粘贴到另一个图像的中心。理想情况下，我希望裁切后的图像小于粘贴的图像，以便在粘贴的图像周围有一个边框，但我不知道这样是否可行。

这是我尝试过的方法（以及由此产生的错误消息）：

>>> import Image
>>> grey = Image.new('RGB', (200, 200), "grey")
>>> House = Image.open("House01.jpg")
>>> print grey.size, grey.mode, grey.format
>>>(200, 200) RGB None
>>> print House.size, House.mode, House.format
>>>(300, 300) RGB JPEG
>>> box = (25, 25, 25, 25)
>>> House.crop(box)
>>>Image._ImageCrop image mode=RGB size=0x0 at 0x11AD210>
>>> region = House.crop(box)
>>> region.show()
>>>Traceback (most recent call last):
 >>> File "<pyshell#28>", line 1, in <module>
    region.show()
>>>  File "C:\Python26\lib\site-packages\PIL\Image.py", line 1483, in show
    _show(self, title=title, command=command)
>>>  File "C:\Python26\lib\site-packages\PIL\Image.py", line 2123, in _show
    apply(_showxv, (image,), options)
>>>  File "C:\Python26\lib\site-packages\PIL\Image.py", line 2127, in _showxv
    apply(ImageShow.show, (image, title), options)
>>>  File "C:\Python26\lib\site-packages\PIL\ImageShow.py", line 41, in show
    if viewer.show(image, title=title, **options):
>>>  File "C:\Python26\lib\site-packages\PIL\ImageShow.py", line 66, in show
    self.show_image(image, **options)
>>>  File "C:\Python26\lib\site-packages\PIL\ImageShow.py", line 85, in show_image
    return self.show_file(self.save_image(image), **options)
>>>  File "C:\Python26\lib\site-packages\PIL\ImageShow.py", line 81, in save_image
    return image._dump(format=self.get_format(image))
>>>  File "C:\Python26\lib\site-packages\PIL\Image.py", line 493, in _dump
    self.save(file, format)
>>>  File "C:\Python26\lib\site-packages\PIL\Image.py", line 1439, in save
    save_handler(self, fp, filename)
>>>  File "C:\Python26\lib\site-packages\PIL\BmpImagePlugin.py", line 242, in _save
    ImageFile._save(im, fp, [("raw", (0,0)+im.size, 0, (rawmode, stride, -1))])
>>>  File "C:\Python26\lib\site-packages\PIL\ImageFile.py", line 498, in _save
    e.setimage(im.im, b)
>>>SystemError: tile cannot extend outside image

我可以看到“区域”的大小已设为（0,0），但我不明白为什么。

任何对此的帮助将非常感谢