Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.postscript > #1699

Re: PS/PDF document analysis tool?

Show all headers | View raw

>>>>> "ken" == ken  <ken@spamcop.net> writes:

    >> I simplified the object form from "123 0" to just "123" to
    >> conserve space.  Also because none of the PDFs I tested had
    >> anything other than 0 in the second position.  (What is the
    >> second position for, includes from other files?)

    ken> Revisions. If you modify an object you can include both in the
    ken> PDF file, with different generation numbers. It allows you to
    ken> easily undo chagnes even after saving the modified file. Its a
    ken> not much used feature.

No.   Generations are  not meant/used  for revisions.   For  what you've
described, appending  a new xref table at  the end will do  the job.  (A
smart reader will  allow you to view older revisions,  or you can remove
the appended xref table to  undo the revision.)

Generation is meant  for the case when the same  object id is *recycled*
to be  used for  a different object.   This latter  need not be  a later
version of the previous object.



-- 
Lee Sau Dan                     李守敦                          ~{@nJX6X~}

E-mail: danlee@informatik.uni-freiburg.de
Home page: http://www.informatik.uni-freiburg.de/~danlee

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

Back to comp.lang.postscript | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: PS/PDF document analysis tool? ken <ken@spamcop.net> - 2011-02-04 07:48 +0000
  Re: PS/PDF document analysis tool? LEE Sau Dan <danlee@informatik.uni-freiburg.de> - 2011-02-05 00:19 +0800

csiph-web