Renice and Renee at the Pasir Panjang Segari Turtle Management Center (via Aperture Light Table)
You'll see some jaggies in the image at 100%.
I had attempted to use Aperture's Light Table feature to assemble the images, not realizing that a 505 MB file was created when I printed the Light Table and saved as a PDF.
I then opened up the PDF in Preview, and saved as a PNG.
This route is probably not a good idea to create a simple collage.
CPU usage was way, way high, and the file size of the print PDF is way too huge.
I think the PDF would be better-utilized for printing really large, as it does seem that the full-resolution images get embedded in the document.
I'll probably try using the Book feature and see if I get better results.
Update: I get better results by using Aperture's book feature.