python - 图像在 Django 模板中旋转

Question

我正在将一些图像加载到 Django 模型中。

当我通过 Django 模板显示这些图像时，肖像图像会旋转。如果我通过 Django Admin 通过单击它们按预期显示的链接来查看这些相同的图像。

这是我加载图像的 View :

def upload_profile(request, user_id):
    variables = {}
    if request.POST:
        user_form = UserForm(request.POST, instance=User.objects.get(id=request.user.id))
        myuser_form = MyUserForm(request.POST, request.FILES, instance=MyUser.objects.get(user__id=request.user.id))

        if user_form.is_valid() and myuser_form.is_valid():
            user_form.save()
            myuser = myuser_form.save()
            myuser.photo = apply_orientation(myuser.photo)
            myuser.save()

            return game_selection(request)

    variables['user_form'] = user_form
    variables['myuser_form'] = myuser_form

    return render(request, 'esc/profile.html', variables)

这就是我应用旋转的方式:

def flip_horizontal(im): return im.transpose(Image.FLIP_LEFT_RIGHT)
def flip_vertical(im): return im.transpose(Image.FLIP_TOP_BOTTOM)
def rotate_180(im): return im.transpose(Image.ROTATE_180)
def rotate_90(im): return im.transpose(Image.ROTATE_90)
def rotate_270(im): return im.transpose(Image.ROTATE_270)
def transpose(im): return rotate_90(flip_horizontal(im))
def transverse(im): return rotate_90(flip_vertical(im))
orientation_funcs = [None,
                 lambda x: x,
                 flip_horizontal,
                 rotate_180,
                 flip_vertical,
                 transpose,
                 rotate_270,
                 transverse,
                 rotate_90
                ]

def apply_orientation(im):
    """
    Extract the oritentation EXIF tag from the image, which should be a PIL Image instance,
    and if there is an orientation tag that would rotate the image, apply that rotation to
    the Image instance given to do an in-place rotation.

    :param Image im: Image instance to inspect
    :return: A possibly transposed image instance
    """

    try:
        kOrientationEXIFTag = 0x0112
        if hasattr(im, '_getexif'): # only present in JPEGs
            e = im._getexif()       # returns None if no EXIF data
            if e is not None:
                #log.info('EXIF data found: %r', e)
                orientation = e[kOrientationEXIFTag]
                f = orientation_funcs[orientation]
                return f(im)
    except:
        # We'd be here with an invalid orientation value or some random error?
        pass # log.exception("Error applying EXIF Orientation tag")
    return im

我的代码似乎从未通过条件if hasattr(im, '_getexif'):

**** 编辑 ****

所以它没有通过，因为无论我加载什么图像，都没有“_getexif”。

如果我添加 print getattr(im, '_getexif') 我会收到以下错误，其中包含所有图像

'ImageFieldFile' object has no attribute '_getexif'

Answer 1

所以我删除了上面的所有代码并用以下代码替换

from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill, Transpose, SmartResize

class MyUser(models.Model):
  avatar = models.ImageField(upload_to='upload/avatars', max_length=255, blank=True, null=True)
  avatar_thumbnail = ImageSpecField(
    source='avatar',
    processors = [Transpose(),SmartResize(200, 200)],
    format = 'JPEG',
    options = {'quality': 75}
  )

有效