Poster can be used to create a large poster by building it from multiple pages
and/or printing it on large media. It expects as input a generic (encapsulated)
postscript file, normally printing on a single page. The output is again a
postscript file, maybe containing multiple pages together building the poster.
The output pages bear cutmarks and have slightly overlapping images for easier
assembling. The input picture will be scaled to obtain the desired size.