Looking through all of these, it is interesting to see how the collages are created. I need to create a poster size collage from the high school's theater production photos. I'll be using PowerPoint so I can arrange however many photos I need for a 20x30 collage. I can only imagine the end result will be enormous in file size if I use @25-35 4x6 photos. Plus I want to add an opaque layer mask with a cutout gavel over top of the collage (the story was about jurors). And add text. Sheesh. The file will be enormous. It needs to be printed. Any suggestions on how to reduce the overall file size once it is completed while allowing it to be printed without loss of quality?