Create Montage

ImageMagik tools can be used to combine multiple images into a single image.

For this, there is a tool called montage. it can be used to combine multiple images together and produce a single image.

montage command takes a space separated list of files. for example, file1.jpg file2.jpg

and the name of the output file as a last argument. For example, see the following command

montage file1.jpg file2.jpg file3.jpg OUTPUT.jpg

References
ImageMagik: http://www.imagemagick.org/
montage tool: http://www.imagemagick.org/script/montage.php