pil example make thumbs (snippet)

Python pil example 'make thumbs'

Functions in program:

def rescale(data, width, height, force=True):

Modules used in program:

import os
import paramiko as ssh_c
import Image as pil
import urllib2

python make thumbs

Python pil example: make thumbs

#!/usr/bin/python
"""
This file takes a url of an image, resizes it, and SFTPs the new
image to a new location.  The image URLs are stored in a MySQL db in 
my case, but YMMV
"""
import urllib2
import Image as pil
import paramiko as ssh_c
import os

def rescale(data, width, height, force=True):
    from cStringIO import StringIO

    """Rescale the given image, optionally cropping it to make sure the result image has the specified width and height."""
    max_width = width
    max_height = height

    input_file = StringIO(data)
    img = pil.open(input_file)
    if not force:
        img.thumbnail((max_width, max_height), pil.ANTIALIAS)
    else:
        src_width, src_height = img.size
        src_ratio = int(src_width) / float(src_height)
        dst_width, dst_height = max_width, max_height
        dst_ratio = int(dst_width) / float(dst_height)

        if dst_ratio < src_ratio:
            crop_height = src_height
            crop_width = crop_height * dst_ratio
            x_offset = int(src_width - crop_width) / 2
            y_offset = 0
        else:
            crop_width = src_width
            crop_height = crop_width / dst_ratio
            x_offset = 0
            y_offset = int(src_height - crop_height) / 3
        img = img.crop((x_offset, y_offset, x_offset+int(crop_width), y_offset+int(crop_height)))
        img = img.resize((dst_width, dst_height), pil.ANTIALIAS)
        input_file.close()

    return img



url="http://myimage.example.com/myimage.jpg"
try:
    img = urllib2.urlopen(url).read()
except Exception, err:
    print("fail:bad-link")

try:
    t_img = rescale(img,200,200)
except Exception, err:
    print("fail:no-resize")

img_name = "saveme_simple.jpg"

try:
    t_img.save(img_name,'JPEG')
except Exception, err:
    os.remove(img_name)
    print("fail:no-save")

#sftp to remote site and save
ssh = ssh_c.SSHClient()
ssh.set_missing_host_key_policy(ssh_c.AutoAddPolicy())
ssh.connect('my.example.com', username='ssh-username', password='ssh-password')
    sftp = ssh.open_sftp()
sftp.put(img_name,'/some/dir/loc/'+img_name)
os.remove(img_name)
sftp.close()
ssh.close()

Python links

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