simple image processing in python

[Randall Hopper]

Kevin Cazabon:

 |You can easily get the sizes of the files with PIL, without loading the
 |entire image.
...
 |PIL doesn't actually load the data until you perform an operation that
 |requires that it is loaded... so just getting the size is very quick, even
 |with a 400MB image file.

Can you read the pixels from a big image with PIL (say, line-by-line), or
are you limited to listing header info.

------------------------------------------------------------------------------
>>> im = Image.open( "penn_mrlc.tif" )
>>> im.size
(24758, 13716)                             <---------------------
>>> im.info
{'compression': 'raw'}
>>> len( im.tile )
13716

>>> im.thumbnail( (128,128) )
Traceback (innermost last):
  File "<stdin>", line 1, in ?
  File "/home/rhh/software/python-1.5.2/lib/python1.5/site-packages/PIL/Image.py", line 723, in thumbnail
    self.load(1)
  File "/home/rhh/bin/../software/python/lib/python1.5/site-packages/PIL/ImageFile.py", line 134, in load
    d = Image._getdecoder(self.mode, d, a, self.decoderconfig)
  File "/home/rhh/software/python-1.5.2/lib/python1.5/site-packages/PIL/Image.py", line 225, in _getdecoder
    return apply(decoder, (mode,) + args + extra)
ValueError: unknown raw mode
------------------------------------------------------------------------------

-- 
Randall Hopper
aa8vb at yahoo.com