Question

我正在覆盖modelAdmin的save_model方法，将图片大小调整为650，并通过管理页面上传：

def save_model(self, request, obj, form, change):
    basewidth = 650
    img = PIL.Image.open(form.cleaned_data['image_file'])

    if img.size[0] > basewidth:
        wpercent = (basewidth / float(img.size[0]))
        hsize = int((float(img.size[1]) * float(wpercent)))
        img = img.resize((basewidth, hsize), PIL.Image.ANTIALIAS)

        img_filefield = getattr(obj, 'image_file')
        random_image_name = ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(30)) + '.jpeg'
        img.save(random_image_name)
        img_filefield.save(random_image_name, ContentFile(img))
        obj.save()
    else:
        obj.save()

它正在保存图像，但图像被破坏，如果我打开它，只有"invalid image"的黑色图像。

我在上面的代码中做错了什么？

Answer 1

我不知道PIL图像的类型与Django ImageField类型不同。感谢Skitz的answer，我可以这样解决：

def save_model(self, request, obj, form, change):
    basewidth = 650
    img = PIL.Image.open(form.cleaned_data['image_file'])

    if img.size[0] > basewidth:
        wpercent = (basewidth / float(img.size[0]))
        hsize = int((float(img.size[1]) * float(wpercent)))
        img = img.resize((basewidth, hsize), PIL.Image.ANTIALIAS)

        img_file_lang = getattr(obj, 'image_file')
        random_image_name = ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(30)) + '.jpeg'

        image_io = StringIO.StringIO()
        img.save(image_io, format='JPEG')

        img_file_lang.save(random_image_name, ContentFile(image_io.getvalue()))
        obj.save()
    else:
        obj.save()

别忘了这样做：import StringIO

Django Python PIL保存图像 - 破碎的图像

1 个答案: