imageborder

We have been testing imageborder with very good results from the command
line. But I can't get it to work from a do shell script in applescript.
This works      do shell script "/opt/local/bin/identify /test44.jpg"
This doesn't    do shell script "/opt/local/bin/imageborder /test44.jpg
/test44out.jpg"
FILE   /test44.jpg   NOT READABLE OR HAS ZERO SIZE   --NOTE: same file
works with 'identify'

This works in terminal
$imageborder /test44.jpg /test44out.jpg

As does this
$/opt/local/bin/imageborder /test44.jpg /test44out.jpg

Anyone have any troubleshooting tips? I'm out of ideas.
Thanks for any help.
Mark