问题描述

我正在尝试创建一组缩略图，每个缩略图都是从原始图像单独缩小的.

I'm trying to create a set of thumbnails, each one separately downscaled from the original image.

image = Image.open(path)
image = image.crop((left, upper, right, lower))
for size in sizes:
  temp = copy.copy(image)
  temp.thumbnail((size, height), Image.ANTIALIAS)
  temp.save('%s%s%s.%s' % (path, name, size, format), quality=95)

上面的代码似乎可以正常工作，但是在测试时我发现一些图像(我不知道它们有什么特别之处，可能只适用于 PNG)会引发此错误:

The above code seemed to work fine but while testing I discovered that some images (I can't tell what's special about them, maybe only for PNG) raise this error:

/usr/local/lib/python2.6/site-packages/PIL/PngImagePlugin.py in read(self=<PIL.PngImagePlugin.PngStream instance>)
line: s = self.fp.read(8)
<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'read' 

没有 copy() 这些图像就可以正常工作.

Without the copy() these images work just fine.

我可以为每个缩略图重新打开并裁剪图像，但我希望有一个更好的解决方案.

I could just open and crop the image anew for every thumbnail, but I'd rather have a better solution.

推荐答案

我猜 copy.copy() 不适用于 PIL Image 类.尝试使用 Image.copy() 代替，因为它的存在是有原因的:

I guess copy.copy() does not work for the PIL Image class. Try using Image.copy() instead, since it is there for a reason:

image = Image.open(path)
image = image.crop((left, upper, right, lower))
for size in sizes:
  temp = image.copy()  # <-- Instead of copy.copy(image)
  temp.thumbnail((size, height), Image.ANTIALIAS)
  temp.save('%s%s%s.%s' % (path, name, size, format), quality=95)

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