PIL>>> Image.open('f.GIF').save('f.jpg', 'JPEG') # ?

Dinu C. Gherman gherman at darwin.in-berlin.de
Tue May 23 11:24:22 CEST 2000


Hello,

after studying the PIL tutorial I don't think I found the
proper place explaining why I get an error like this when
I try to save a GIF file in JPEG format:

>>> im = Image.open('sample.gif')
>>> im.save('sample.jpg', 'jpeg')
Traceback (innermost last):
  File "<interactive input>", line 0, in ?
  File "Image.py", line 665, in save
    SAVE[string.upper(format)](self, fp, filename)
  File "JpegImagePlugin.py", line 298, in _save
    raise IOError, "cannot write mode %s as JPEG" % im.mode
IOError: cannot write mode P as JPEG

Is it because palette mode images cannot be converted to 
JPEG? If so, can it be done with the pilconvert utility?
I haven't tested this, but if pilconvert can do it, why
isn't it possible without?

Regards,

Dinu

-- 
Dinu C. Gherman
................................................................
"The only possible values [for quality] are 'excellent' and 'in-
sanely excellent', depending on whether lives are at stake or 
not. Otherwise you don't enjoy your work, you don't work well, 
and the project goes down the drain." 
                    (Kent Beck, "Extreme Programming Explained")



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