Calling ImageMagick's convert
cmr.Pent at gmail.com
cmr.Pent at gmail.com
Mon Dec 22 03:15:01 EST 2008
Hello group!
I'm a Python beginner. I'm trying to call ImageMagick's convert
program from my code.
My OS is Debian testing, and my version of Python is 2.5.
I've just stumbled upon a problem:
(1) subprocess.call('convert in.png -resize 640x480 out.png', shell =
True)
works, but none of the following does:
(2) subprocess.call('convert in.png -resize 640x480 out.png')
(3) subprocess.call(['convert', 'in.png', '-resize 640x480',
'out.png'])
(4) subprocess.call(['convert', 'in.png', '-resize 640x480',
'out.png'], shell = True)
In these cases, convert program says 'unrecognized option -resize
640x480'.
At the same time,
subprocess.call(['ls', '-l'])
works as expected.
I'd like to use variant (3), as it seems the most handy. I don't
understand why is shell = True required in case of convert. Is it a
bug in Python, in ImageMagick, or am I missing something very basic
here?
Any hint appreciated.
Andrey
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