如何使用 ImageField 模型调整使用 Django 上传的图像文件的大小? [英] How can I resize an image file uploaded with Django using an ImageField Model?

问题描述

将通过 Django 表单上传的图像文件调整为 ImageField 的最直接方法是什么?

What is the most straightforward method to resize an image file uploaded via a Django form as an ImageField?

推荐答案

我很生气，因为我找不到完整的工作示例，只有零零碎碎.我设法自己把解决方案放在一起.这是完整的例子，我把它放在表单的 clean() 方法中(你也可以覆盖模型的 save() 方法，以完全相同的方式 - 更改 ImageField 的文件属性).

I was annoyed that I couldn't find a complete working example, only bits here and there. I managed to put the solution together myself. Here is the complete example, I put it in clean() method of the form (you can also override models save() method, in the completely same way - changing ImageField's file property).

import StringIO
from PIL import Image

image_field = self.cleaned_data.get('image_field')
image_file = StringIO.StringIO(image_field.read())
image = Image.open(image_file)
w, h = image.size

image = image.resize((w/2, h/2), Image.ANTIALIAS)

image_file = StringIO.StringIO()
image.save(image_file, 'JPEG', quality=90)

image_field.file = image_file

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