🚀 go-pugleaf

If a PostScript file really is DSC compliant, extracting pages is a
fairly simple mechanical process. For instance, the information that
marks page 431 should follow a line

%%Page: 431 431

and run to %%EndPage or the next %%Page: line. It's not quite a simple
as that might suggest, but it is at least doable - without DSC it may
not be possible at all.

I have heard of a tool psselect that supposedly can extract pages from
a DSC compliant file and save it as a new valid file.

(Why may it be impossible?  Consider this code

/pagenumber 1 def
10  % repeat count
{
  /Helvetica 20 selectfont 72 500 moveto % prepare to show text
  pagenumber 10 string cvi % convert pagenumber to string
  show % write page number
  showpage % finish page
  /pagenumber pagenumber 1 add def  % increase pagenumber
}
repeat

This page writes 10 pages, each with a number. Clearly, you cannot use
any simple "cut here" logic to extract page 3. That's not to say the
task cannot be done; typically the entire file would be converted to
PDF, then PDF pages extracted, and finally a new PostScript file
written)

Aandi Inston