在matlab脚本中,我使用shell转义字符“!”运行其他Python脚本,如外部命令。 所有运行都没有任何问题,除了添加了一部分关于模块Wand的代码(我需要将images.pdf转换为images.png和裁剪边距)。 这是令人难以置信的,它不是从matlab工作,但是如果它是从shell启动的,它工作得非常好!在Python脚本中调用matlab中的操作系统时,Wand Python模块似乎无法工作
从Python解释器,它工作正常:
:~ $ python
Python 2.7.9 (v2.7.9:648dcafa7e5f, Dec 10 2014, 10:10:46)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from wand.image import Image as wandImage
>>> with wandImage(filename = '/Users/toto/test.pdf') as img:
... img.save(filename = '/Users/toto/test.png')
...
>>>
从脚本,它工作正常:
-The脚本test.py:
$ pwd; ls -l test.py
/Users/toto
-rwxrwxrwx 1 toto staff 326 22 sep 10:23 test.py
$
$ more test.py
#! /usr/bin/python
# -*- coding: utf-8 -*- # Character encoding, recommended
## -*- coding: iso-8859-1 -*- # Character encoding, old (Latin-1)
from wand.image import Image as wandImage
with wandImage(filename = '/Users/toto/test.pdf') as img:
img.save(filename = '/Users/toto/test.png')
- 在一个shell中调用:
$ /Users/toto/test.py
$
从MATLAB,不工作:
>> ! /Users/toto/test.py
Traceback (most recent call last):
File "/Users/toto/test.py", line 9, in <module>
img.save(filename = '/Users/toto/test.png')
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/wand/image.py", line 2719, in save
self.raise_exception()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/wand/resource.py", line 222, in raise_exception
raise e
wand.exceptions.WandError: wand contains no images `MagickWand-1' @ error/magick-image.c/MagickWriteImage/13115
>>
Arghhh我感觉像笼子里的狮子。我想我已经忘记了一些东西,但我没有找到! 任何帮助/建议将非常感谢!
编辑1:
看来,问题来自ImageMagick的的“转换”功能。
- 在一个外壳,做工精细:
$ /usr/local/bin/convert /Users/toto/test.pdf -crop 510x613+42+64 /Users/toto/test-crop.png
$
- 在Matlab的,不工作:
>>! /usr/local/bin/convert /Users/toto/test.pdf -crop 510x613+42+64 /Users/toto/test-crop.png
convert: no images defined `/Users/toto/test-crop.png' @ error/convert.c/ConvertImageCommand/3230.
>>
:-(