Posters are printed from your digital files or from scans of your film or flat reflective original. Posters are printed on satin or glossy photo paper and are intended to be high quality, short run presentation or display prints where the quantity needed isn't large enough to print on a printing press. In fact, the quantity is often just one print. Most common sizes are 12"x18" (mini-poster), 20"x30", 22"x28" and 24"x36" though almost any size is possible.