将 Base64 字符串加载到 Python 图像库中

问题描述

我通过 ajax 将图像作为 base64 字符串发送到 django.在我的 django 视图中，我需要调整图像大小并将其保存在文件系统中.

I'm sending images as base64 string through ajax to django. In my django view I need to resize the image and save it in the file system.

这是一个base64字符串(简体):

Here is a base64 string(simplified):

data:image/jpeg;base64,/9j/4AAQSkZJRg-it-keeps-going-for-few-more-lines=

我尝试使用以下 python 代码在 PIL 中打开它:

I tried to open this in PIL using the below python code:

img = cStringIO.StringIO(request.POST['file'].decode('base64'))
image = Image.open(img)
return HttpResponse(image, content_type='image/jpeg')

我正在尝试将上传的图片显示回来，但是firefox抱怨'图片无法显示，因为它包含错误'

I'm trying to display the uploaded image back, but firefox complains that 'The image cannot be displayed because it contains error'

我无法弄清楚我的错误.

I couldn't figure out my mistake.

解决方案:

pic = cStringIO.StringIO()

image_string = cStringIO.StringIO(base64.b64decode(request.POST['file']))

image = Image.open(image_string)

image.save(pic, image.format, quality = 100)

pic.seek(0)

return HttpResponse(pic, content_type='image/jpeg')

推荐答案

解决方案:

将打开的 PIL 图像保存到类似文件的对象可以解决问题.

Saving the opened PIL image to a file-like object solves the issue.

pic = cStringIO.StringIO()
image_string = cStringIO.StringIO(base64.b64decode(request.POST['file']))
image = Image.open(image_string)
image.save(pic, image.format, quality = 100)
pic.seek(0)
return HttpResponse(pic, content_type='image/jpeg')

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