Ideal size for images is 900×1250. They’ll nee to be this ratio to make the gallery work without different sized pictures.
The name at the bottom of the gallery images is created by fading to transparent between 1100 & 1130px (easiest way is to create a layer mask in GIMP).
Font for the writing is Sans @ 65px (in GIMP (free photoshop package)
Naming convention has been to label the images [name]_9x12.5.png and [name]_9x12.5_named.png