http://www.imagemagick.org/script/command-line-tools.php
http://www.imagemagick.org/script/composite.php
http://www.imagemagick.org/script/montage.php
http://www.imagemagick.org/script/composite.php
http://www.imagemagick.org/script/montage.php
ImageMagick montage
If you have 35 images in a directory this will create a montage of 7x5 tiles with no space between each image
$ montage *.png -geometry '1x1+0+0<' singlebigtile.png
more examples
more imagemagick montage examples using the imagemagick built-in images netscape and rose !$ montage rose: null: null: rose: mont.png
$ montage rose: null: null: null: rose: mont.png
$ montage netscape: netscape: netscape: mont.png
$ montage netscape: netscape: netscape: netscape: mont.png
$ montage rose: null: null: null: rose: mont.png
$ montage netscape: netscape: netscape: mont.png
$ montage netscape: netscape: netscape: netscape: mont.png
REFERRERS
ImageMagick
