如何将django图像场转换为PIL图像并返回？

Given a django image field, how do I create a PIL image and vice-versa?

给定django图像字段，如何创建PIL图像，反之亦然？

Simple question, but hard to google :(

简单的问题，但很难谷歌:(

(I'm going to use django-imagekit 's processor to rotate an image already stored as model attribute.)

（我将使用django-imagekit的处理器来旋转已经存储为模型属性的图像。）

edit

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]:

2 个解决方案

#1

The first question:

第一个问题：

import Image

pil_image_obj = Image.open(model_instance.image_field)

The second question:

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()

UPDATE

UPDATE

According to OP's comment, replacing import Image with from PIL import Image solved his problem.

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

#2

To go from PIL image to Django ImageField, I used falsetru's answer, but I had to update it for Python 3.

要从PIL图像转到Django ImageField，我使用了falsetru的答案，但我不得不为Python 3更新它。

First, StringIO has been replaced by io as per: StringIO in python3

首先，StringIO已经被io替换为python3中的StringIO

Second, When I tried io.StringIO(), I recieved an error saying: "*** TypeError: string argument expected, got 'bytes'". So I changed it to io.BytesIO() and it all worked.

第二，当我尝试io.StringIO（）时，我收到一条错误说：“*** TypeError：字符串参数预期，得到'字节'”。所以我把它改成了io.BytesIO（），这一切都奏效了。

from PIL import Image
from io import BytesIO
from django.core.files.base import ContentFile

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

#1