How to send image generated by PIL to browser?

Here's a version without any temp files and the like (see here):

def serve_pil_image(pil_img):    img_io = StringIO()    pil_img.save(img_io, 'JPEG', quality=70)    img_io.seek(0)    return send_file(img_io, mimetype='image/jpeg')

To use in your code simply do

@app.route('some/route/')def serve_img():    img = Image.new('RGB', ...)    return serve_pil_image(img)

Mr. Mr. did an excellent job indeed. I had to use BytesIO() instead of StringIO().

def serve_pil_image(pil_img):    img_io = BytesIO()    pil_img.save(img_io, 'JPEG', quality=70)    img_io.seek(0)    return send_file(img_io, mimetype='image/jpeg')

First, you can save the image to a tempfile and remove the local file (if you have one):

from tempfile import NamedTemporaryFilefrom shutil import copyfileobjfrom os import removetempFileObj = NamedTemporaryFile(mode='w+b',suffix='jpg')pilImage = open('/tmp/myfile.jpg','rb')copyfileobj(pilImage,tempFileObj)pilImage.close()remove('/tmp/myfile.jpg')tempFileObj.seek(0,0)

Second, set the temp file to the response (as per this stackoverflow question):

from flask import send_file@app.route('/path')def view_method():    response = send_file(tempFileObj, as_attachment=True, attachment_filename='myfile.jpg')    return response