在matlab腳本中,我使用shell轉義字符「!」運行其他Python腳本,如外部命令。 所有運行都沒有任何問題,除了添加了一部分關於模塊Wand的代碼(我需要將images.pdf轉換爲images.png和裁剪邊距)。 這是令人難以置信的,它不是從matlab工作,但是如果它是從shell啓動的,它工作得非常好!在Python腳本中調用matlab中的操作系統時,Wand Python模塊似乎無法工作
從Python解釋器,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')
...
>>>
從腳本,它工作正常:
-The腳本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')
- 在一個shell中調用:
$ /Users/toto/test.py
$
從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我感覺像籠子裏的獅子。我想我已經忘記了一些東西,但我沒有找到! 任何幫助/建議將非常感謝!
編輯1:
看來,問題來自ImageMagick的的「轉換」功能。
- 在一個外殼,做工精細:
$ /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.
>>
:-(