jinja2 - 如何动态显示 PIL Image

Question

我想使用 PIL 裁剪我的图像文件库并使用 Flask 和 Jinja 显示它。

我试过这个代码:

@bp.route('/media/<fname>')
def fetch_media(fname):
...
    image = Image.open(path)
    cropped_image = image.crop(box)
    return cropped_image

这给出了一个类型错误:

The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a Image.

如何将图像返回到 html 页面？

Answer 1

未经测试，但肯定非常接近这个:

import io
from PIL import Image
from flask import Response

....
....
buffer = io.BytesIO()
cropped_image.save(buffer, format="PNG")
return Response(buffer.getvalue(), mimetype='image/png')