Exctract GIF comment from image

[wingi@gmx.com]

Hi,

simple question: The PIL does not support reading the optional
description in GIF Images.

http://www.pythonware.com/library/pi...format-gif.htm

After some reasearch I could not find a python solution for this, any
suggestions?

Thanx, Wingi.

[Miki]

Re: Exctract GIF comment from image

Hello Wingi,

simple question: The PIL does not support reading the optional
description in GIF Images.
>
http://www.pythonware.com/library/pi...format-gif.htm
>
After some reasearch I could not find a python solution for this, any
suggestions?

Use ImageMagick (www.imagemagick.org), "identify -verbose <image>"
should have the comments somewhere
in the output.
There also a python binding to ImageMagick but I have no experience
with it.

HTH,
--
Miki <miki.tebeka@gm ail.com>

http://pythonwise.blogspot.com

[Guilherme Polo]

Re: Exctract GIF comment from image

2008/3/11, wingi@gmx.com <wingi@gmx.com> :

Hi,
>
simple question: The PIL does not support reading the optional
description in GIF Images.
>
http://www.pythonware.com/library/pi...format-gif.htm
>
After some reasearch I could not find a python solution for this, any
suggestions?
>
Thanx, Wingi.
>
--

http://mail.python.org/mailman/listinfo/python-list

>

I did a quick thing here, try it and check if it solves the problem for you:

import os
import sys
import struct

def extract_comment s(giffile):
fobj = open(giffile, 'rb')

giftype = fobj.read(6)
pf = struct.unpack(' <hhBBB', fobj.read(7))[2]
if pf & 0x80:
pallete_size = 2 << (pf & 0x07)
fobj.read(3 * pallete_size)
# finished reading header

fsize = os.stat(giffile ).st_size
while fobj.tell() != fsize:
mark = ord(fobj.read(1 ))

if mark == 0x21: # gif extension
label = ord(fobj.read(1 ))
is_comment = label == 254

# read the extension block
blocksize = ord(fobj.read(1 ))
while blocksize:
if is_comment:
print fobj.read(block size)
else:
fobj.read(block size)

blocksize = ord(fobj.read(1 ))

def main(args):
if len(args) < 2:
print "Usage: %s <gif file..." % args[0]
sys.exit(0)

for gif in args[1:]:
extract_comment s(gif)

if __name__ == "__main__":
main(sys.argv)

--
-- Guilherme H. Polo Goncalves

[wingi@gmx.com]

Re: Exctract GIF comment from image

On 11 Mrz., 18:39, "Guilherme Polo" <ggp...@gmail.c omwrote:

2008/3/11, wi...@gmx.com <wi...@gmx.com> :
>

Hi,

>

simple question: ThePILdoes not support reading the optional
description in GIF Images.

>
>
I did a quick thing here, try it and check if it solves the problem for you:
>

Wow - thanx for the fast answer!

Yes it works and can use it ;-)

*smile*