Upload resized image to S3

Question

I\'m trying to upload resized image to S3:

fp = urllib.urlopen(\'http:/example.com/test.png\')
img = cStringIO.StringIO(fp.read())

im = Image.open(img)
im2          


        

Answer 1

print ("loading object", input_bucket, input_key)
response = s3client.get_object(Bucket=input_bucket, Key=input_key)
print("s3 get object response", response)

body = response['Body']

image = Image.open(body)

print ("generating thumbnail", output_width, output_height)

thumbnail = resizeimage.resize_thumbnail(
    image, [output_width, output_height])
body.close()

print ("saving thumbnail", output_format)

with io.BytesIO() as output:
    thumbnail.save(output, output_format)

    print ("uploading thumbnail", output_bucket, output_key)
    output.seek(0)
    s3client.put_object(Bucket=output_bucket, Key=output_key,
                        Body=output, ContentType=output_content_type)

Answer 2

My guess is that Key.set_contents_from_filename expects a single string argument, but you are passing in im2, which is some other object type as returned by Image.resize. I think you will need to write your resized image out to the filesystem as a name file and then pass that file name to k.set_contents_from_filename. Otherwise find another method in the Key class that can get the image contents from an in-memory construct (StringIO or some object instance).

Answer 3

You need to convert your output image into a set of bytes before you can upload to s3. You can either write the image to a file then upload the file, or you can use a cStringIO object to avoid writing to disk as I've done here:

import boto
import cStringIO
import urllib
import Image

#Retrieve our source image from a URL
fp = urllib.urlopen('http://example.com/test.png')

#Load the URL data into an image
img = cStringIO.StringIO(fp.read())
im = Image.open(img)

#Resize the image
im2 = im.resize((500, 100), Image.NEAREST)  

#NOTE, we're saving the image into a cStringIO object to avoid writing to disk
out_im2 = cStringIO.StringIO()
#You MUST specify the file type because there is no file name to discern it from
im2.save(out_im2, 'PNG')

#Now we connect to our s3 bucket and upload from memory
#credentials stored in environment AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
conn = boto.connect_s3()

#Connect to bucket and create key
b = conn.get_bucket('example')
k = b.new_key('example.png')

#Note we're setting contents from the in-memory string provided by cStringIO
k.set_contents_from_string(out_im2.getvalue())