What is the best pdf editor for ubuntu?

[Christoph Bier]

Luis Paulo schrieb am 17.04.2010 06:51:

[...]

> And when I wonder about PDF not being open, neither the software, I should
> have said I think the software that produces *adobe* pdf format is not open.

[...]

> The point was that today you can't have a successful linux pdf editor of
> adobe documents unless, maybe, adobe makes it.
[...]
> Because adobe didn't release the source of adobe acrobat, and I'll bet that
> the format it produces is not standard.

??? I propose you discuss this with a real PDF expert (try
comp.text.pdf). After your posting I did the same in the german
newsgroup de.comp.text.tex. And ...

> Not the latest version, not the
> previous, not the next. It will always have a lot of non standard and
> undocumented tweaks.
> Again, may be wrong all the way, I don't know, its just an educated guess.

... yes, you are wrong. From
http://www.adobe.com/devnet/acrobat/pdfs/pdfregistry_v3.pdf:

----------------------------------------------------------------
When a new version of PDF is defined, many features are
introduced simply by adding new entries to existing
dictionaries. Earlier versions of conforming readers do not
notice the existence of such entries and behave as if they were
not there. Such new features are therefore both forward- and
backward-compatible. Likewise, adding entries not described in
the PDF specification to dictionary objects does not affect the
conforming reader’s behaviour. See Annex E for information on how
to choose key names that are compatible with future versions of
PDF. See 7.12.2, “Developer Extensions Dictionary” for a
discussion of how to designate the use of public extensions in
PDF file.

In some cases, a new feature is impossible to ignore, because
doing so would preclude some vital operation such as viewing or
printing a page. For instance, if a page’s content stream is
encoded with some new type of filter, there is no way for an
earlier version of conforming reader to view or print the page,
even though the content stream (if decoded) would be perfectly
understood by the reader.  There is little choice but to give an
error in cases like these.  Such new features are
forward-compatible but not backward-compatible.

In a few cases, new features are defined in a way that earlier
versions of conforming readers will ignore, but the output will
be degraded in some way without any error indication. If a PDF
file undergoes editing by an earlier version of a conforming
product that does not understand some of the features that the
file uses, the occurrences of those features may or may not
survive. public extensions in PDF file.
-----------------------------------------------------------------

There are no secrets Adobe Acrobat products integrate. The reason
why there are no FOSS PDF editors is the complexity of the PDF
graphic format. Even the FOSS readers---at least I don't know one
that does---do not support every PDF feature (e. g. annotations).
Before the FOSS world needs a PDF editor it needs a full featured
PDF viewer, IMO.

[...]

> Really appreciate your comments.
> Just don't know what is "schrieb", but I'm guessing it's something like
> escreveu. Kidding.

You are right.

Best
Christoph
-- 
+++ Typografie-Regeln (1.7): http://zvisionwelt.de/?page_id=56