I'm trying to call an ImageMagick command from Python 2.7 using subprocess.call. My problem is that the argument parser in subprocess puts a double quotation mark around every argument, and ImageMagick seems to have a problem with quotes around non-file arguments. 

What I'd like is something like this

```
"imagemagick.exe" "im1.png" "im2.png" -alpha off ( ... ) -composite "im3.png"

```

So far I couldn't find a way to do it with subprocess, other than manually constructing the string with ugly `+ " " +` elements and calling it with `shell=True`.

Here is my code:

```
args = [    imagemagick,
            filename + "_b.bmp",
            filename + "_w.bmp",
            "-alpha off ( -clone 0,1 -compose difference -composite -negate ) ( -clone 0,2 +swap -compose divide -composite ) -delete 0,1 +swap -compose Copy_Opacity -composite",
            filename + ".png" ]   

subprocess.call( args )

```

Is there any way to call the correct command without double quotes using subprocess?

**Update**: inserted the full command line. I'd like to keep that part together, not as "alpha", "-off", ... one by one.