Making GIF image twice the size - in memory

[Michele Petrazzo]

Miki wrote:
> Hello All,
> 

Heelo,

> I get an image from a web page (via urlopen), and like to make it 
> twice the size.

<-cut->

> However I don't get a valid GIF image.
> 

Your code work well here!
Why you said that the string are invalid?

--code: test_image_double.py

from urllib import urlopen
import Image
from ImageFile import Parser

def double(image_data):
     image_parser = Parser()
     image_parser.feed(image_data)
     im = image_parser.close()
     new_size = tuple(map(lambda x: 2 * x, im.size))
     new = im.resize(new_size)

     return new.tostring("gif", "P"), new, new_size

url = "http://www.google.com/intl/en_ALL/images/logo.gif"
image_data = urlopen(url).read()
image_data, img, new_size = double(image_data)
img_new = Image.fromstring("P", new_size, image_data, "gif")
img_new.save("./out1.gif")
img.save("./out2.gif")
print "PIL version:", Image.VERSION

-- test

michele:~/tmp$ python test_image_double.py && file out1.gif && file out2.gif
(552, 220) 49554
PIL version: 1.1.5
out1.gif: GIF image data, version 87a, 552 x 220
out2.gif: GIF image data, version 87a, 552 x 220
michele:~/tmp$

> Any ideas?
> 

Forgot to specify that the data aren't in raw format, but to decode it
with the "gif" encoder?

> Thanks,

Ciao,
Michele