python - PIL 来自字符串错误

Question

我有一个png图片，我需要将它保存为字符串，然后用PIL再次打开它。我正在尝试这样做:

output = StringIO.StringIO()
old_image.save(output, format="PNG")
contents = output.getvalue()
output.close()

new_image = Image.fromstring(contents, "RGBA", old_image.size)

但它给了我一个错误:TypeError: 'argument 1 must be string without null bytes, not str'

如何解决这个问题？

Answer 1

你把论点颠倒过来了:

Image.fromstring(mode, size, data, decoder_name='raw', *args)

所以

Image.fromstring("RGBA", old_image.size, contents)

但请注意，直接从 StringIO 对象中读取要容易得多:

output = StringIO.StringIO()
old_image.save(output, format="PNG")

output.seek(0)
new_image = Image.open(output)