Hi All

Im trying to use my standard digital camera to take overlapping photos,
and then stitch those photos together to make a panoramic photo. I am
attempting to use enblend (http://enblend.sourceforge.net/) to blend
them together and remove the stitch lines. However, the input images
required need alpha channels:

enblend: Input image "1.tif" does not have an alpha channel. This is
required to determine which pixels contribute to the final image.

Is there a way to add an alpha channel using a command-line tool like
imagemagick? I have lots of images, so I'd like to script this, which
is why I prefer using shell utilities so I can automate the process.
(I can easily stitch images together using imagemagick's montage tool)
Im running Debian woody on an old server I have lying around.