[poppler] PDF editing operations

[Martin Schröder]

> Yeah poppler doesn't need anything for that.  My tool that I want to
>  write would probably crop some page image fragments (crop the likely
>  areas where page numbers might be found), rotate them through all 4
>  90-degree angles, pipe them to a gocr process, and see what comes out

Most of this is doable with pdftex/luatex; it just needs some
information about the images. And it can use poppler. :-)

Best
   Martin