I am clueles but when I need to do this I use Microsoft Word. Make a table on a page - say 2 columns & 2 rows giving me four boxes.
Next us Format Borders & Shading to make borders = None
Then insert Pictures one at a time into each individual box - Size images - Save & print.
There is very probably a more elegant way.
If you add more rows at the beginning you can type text under the pictures.
Peccavi, January 2009