"Unable to open image" error when using ImageMagick's Filename References

I'm using ImageMagick to do some image processing from the commandline, and would like to operate on a list of files as specified in foo.txt. From the instructions here: http://www.imagemagick.org/script/command-line-processing.php I see that I can use Filename References from a file prefixed with @. When I run something like:

montage @foo.txt output.jpg

everything works as expected, as long as foo.txt is in the current directory. However, when I try to access bar.txt i开发者_如何转开发n a different directory by running:

montage /some_directory/@bar.txt output2.jpg

I get:

montage: unable to open image /some_directory/@bar.txt: No such file or directory @ blob.c/OpenBlob/2480.

I believe the issue is my syntax, but I'm not sure what to change it to. Any help would be appreciated.

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Quite an old entry but it seems relatively obvious that you need to put the @ before the full path:

montage @/some_directory/bar.txt output2.jpg

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As of ImageMagick 6.5.4-7 2014-02-10, paths are not supported with @ syntax. The @ file must be in the current directory and identified by name only.

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I haven't tried directing IM to pull the list of files from a file, but I do specify multiple files on the command line like this:

gm -sOutputFile=dest.ext -f file1.ppm file2.ppm file3.ppm

Can you pull the contents of that file into a variable, and then let the shell expand that variable?