My parent's 50th anniversary is coming up. I've managed to scan and restore their official (but damaged) wedding photo. I was thinking of doing a photo montage with the wedding photo in the centre (it's oval as it was sliced to fit into a specific frame) and then fit smaller photos around it highlighting the last 50 years of their lives. I could probably knock something up in Picasa but the only output option is Jpeg, which isn't a road I want to go down if I want to do a (proposed at this stage) A3-sized canvas. Any advice for something that could help me out and retain a high quality output file? I have access to both a Mac and PC.