[Tutor] Saving an Image in a Given Format

Eric Walstad eric at ericwalstad.com
Mon Mar 31 17:37:10 CEST 2008

Wayne Watson wrote:
> current_image ... convert() and 
> save() must be methods in that class. The question is what class/module? 
> PIL?
I don't know, but you could try the following from the python command 
line, which might give you some hints:


 >>> import Image  # PIL Image class
 >>> im = Image.open('/path/to/foo.jpg')

 >>> dir(im)  # Gives you a list of the object's attribute names
['_Image__transformer', '__doc__', '__getattr__', '__init__', 
'__module__', '_copy', '_dump', '_expand', '_getexif', '_makeself', 
'_new', '_open', 'app', 'applist', 'bits', 'category', 'convert', 
'copy', 'crop', 'decoderconfig', 'decodermaxblock', 'draft', 'filename', 
'filter', 'format', 'format_description', 'fp', 'fromstring', 
'getbands', 'getbbox', 'getcolors', 'getdata', 'getextrema', 'getim', 
'getpalette', 'getpixel', 'getprojection', 'histogram', 'huffman_ac', 
'huffman_dc', 'im', 'info', 'layer', 'layers', 'load', 'load_djpeg', 
'load_end', 'load_prepare', 'mode', 'offset', 'palette', 'paste', 
'point', 'putalpha', 'putdata', 'putpalette', 'putpixel', 
'quantization', 'quantize', 'readonly', 'resize', 'rotate', 'save', 
'seek', 'show', 'size', 'split', 'tell', 'thumbnail', 'tile', 
'tobitmap', 'tostring', 'transform', 'transpose', 'verify']

The following error message tells me the object came from PIL.Image, a 
good hint.

 >>> im.just_throw_me_an_error
Traceback (most recent call last):
   File "/home/ewalstad/var/tmp/<string>", line 1, in <module>
   File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 493, in 
     raise AttributeError(name)
AttributeError: just_throw_me_an_error

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