3R = 3.5" x 5" (1,050 pixel x 1,500pixel)
4R = 4" x 6" (1,200 pixel x 1,800 pixel)
5R = 5" x 7" (1,500 pixel x 2,100 pixel)
6R = 6" x 8" (1,800 pixel x 2,400 pixel)
8R = 8" x 10" (2,400 pixel x 3,000 pixel)
S8R = 8" x 12" (2,400 pixel x 3,600 pixel)
10R = 10" x 12" (3,000 pixel x 3,600 pixel)
S10R = 10" x 15" (3,000 pixel x 4,500 pixel)