django - 如何从Django图像字段转换为PIL图像并返回？

Question

给定django图像字段，如何创建PIL图像，反之亦然？

简单的问题，但很难谷歌:(

（我将使用django-imagekit的处理器旋转已存储为模型属性的图像。）

编辑

In [41]: m.image_1.__class__
Out[41]: django.db.models.fields.files.ImageFieldFile

In [42]: f = StringIO(m.image_1.read())

In [43]: Image.open(f)
---------------------------------------------------------------------------
IOError                                   Traceback (most recent call last)
<ipython-input-43-39949b3b74b3> in <module>()
----> 1 Image.open(f)

/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/PIL/Image.pyc in open(fp, mode)
   2023                 pass
   2024
-> 2025     raise IOError("cannot identify image file")
   2026
   2027 #

IOError: cannot identify image file

In [44]:

Answer 1

第一个问题：

import Image

pil_image_obj = Image.open(model_instance.image_field)

第二个问题：

from cStringIO import StringIO
from django.core.files.base import ContentFile

f = StringIO()
try:
    pil_image_obj.save(f, format='png')
    s = f.getvalue()
    model_instance.image_field.save(model_instance.image_field.name,
                                    ContentFile(s))
    #model_instance.save()
finally:
    f.close()

更新

根据OP的评论，用 import Image替换 from PIL import Image解决了他的问题。