Priyav - PIL Image Handling

PIL Image Handling

Tuesday, 18th May, 2010 // 8:39 p.m.

Just playing around with Tornado Web Server and trying to make a twitter clone with realtime updates. I wanna share the ImageHandling snippet which requires Python Imaging Library module to resize images. BTW for PIL installation there are many valuable resources available on the web.

I will get the image from the form and the imghdr module is used to sniff the content type of the file. In this case, jpeg and png are the accepted file types. Here comes the interesting part, Instead of writing the image to the disk I am using StringIO module which reads the image from the memory. By this we are simulating a file object as expected by Image.open.

I want the image to be in three different sizes.
1. avatar_square the largest square of the uploaded image.
2. thumbnail size (48*48).
3. mininail size (24*24) to show the followers on the side as twitter.

class ImageHandler(BaseHandler):
    @tornado.web.authenticated
    def get(self):
        return self.render("image.html")

    @tornado.web.authenticated
    def post(self):
        user_id=self.current_user
        username = self.db.get("SELECT username from user WHERE id=%s", user_id)
        uploaded_image=self.request.files
        if imghdr.what('ignore', uploaded_image['avatar'][0]['body']) in ['jpeg','png']:
            avatar = Image.open(StringIO.StringIO(uploaded_image['avatar'][0]['body']))
            width, height = avatar.size
                        if width > height:
                            delta = width - height
                            left = int(delta/2)
                            upper = 0
                            right = height + left
                            lower = height
                        else:
                            delta = height - width
                            left = int(delta)/2
                            upper = 0
                            right = width
                            lower = width + upper
                        avatar_square = avatar.crop((left, upper, right, lower))
                        avatar_mini = copy.copy(avatar_square)
                        avatar_square.thumbnail((48,48))
                        avatar_mini.thumbnail((24,24))
                        return self.write("Successfully uploaded the image")
        else: return self.write("file format is not accepted")

gist is here

Tagged: crop , handling , image , pil , resize and square

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