ImageMagick has "montage" which can do this.

As an example, if you have three files named a.jpg, b.jpg and c.jpg that are
each 500x100 pixels (note - any image format will work)
the command 
   > montage -tile 1x3 -geometry 500x100 -borderwidth 0  a.jpg b.jpg  c.jpg
whole.jpg

should sew together the three images, the top of b.jpg sewn to the bottom of
a.jpg, etc. with whole.jpg being 55x200.   

I don't know if it'll work if the last image c.jpg is a different height. 
Haven't used montage much, but when i do, it's great!


Of course, for linux and eunichs, i mean, unix, GIMP is the ultimate image
processing tool, but you'll have to run it manually or write some sort of
module or script.  Blah, why work?


Image Magick is at http://www.wizards.dupont.com/cristy/ImageMagick.html.  It's
free, but of course you have to pay me $250 as a "consultants fee" <lustful
grin>
-- 
Daren Scot Wilson
dar### [at] pipelinecom 
www.newcolor.com
----
"A ship in a harbor is safe, but that is not what ships are built for"
                                            -- William Shedd

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