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image.py - Image manipulation - Module

Put below code file in yourapp/modules/images.py
Given the model
db.define_table("table_name", Field("picture", "upload"), Field("thumbnail", "upload"))
to resize the picture on upload
from images import RESIZE 
db.table_name.picture.requires = RESIZE(200, 200)
to store original image in picture and create a thumbnail in 'thumbnail' field
from images import THUMB 
db.table_name.thumbnail.compute = lambda row: THUMB(row.picture, 200, 200)

Code: modules/images.py











































# 

# -*- coding: utf-8 -*-

from gluon import current

class RESIZE(object):
def __init__(self, nx=260, ny=260, error_message=' image resize'):
(
self.nx, self.ny, self.error_message) = (nx, ny, error_message)

def __call__(self, value):
if isinstance(value, str) and len(value) == 0:
return (value, None)
from PIL import Image
import cStringIO
try:
img = Image.open(value.file)
img.thumbnail((self.nx, self.ny), Image.ANTIALIAS)
s = cStringIO.StringIO()
img.save(s, 'JPEG', quality=100)
s.seek(0)
value.file = s
except:
return (value, self.error_message)
else:
return (value, None)

def THUMB(image, nx=260, ny=260, gae=False, name='thumb'):
if image:
if not gae:
request = current.request
from PIL import Image
import os
#img = Image.open(os.path.join(request.folder,'static','images' + '/' + image[11:13] + '/' + image))
img = Image.open(os.path.join(request.folder , 'static/images/albums/image.file/', image[11:13] +'/'+ image))
img.thumbnail((nx, ny), Image.ANTIALIAS)
root, ext = os.path.splitext(image)
thumb = '%s_%s%s' % (root, name, ext)
img.save(request.folder + 'static/images/albums/image.file/', thumb[11:13] +'/' + thumb)
return thumb
else:
return image

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