Magnus Hagander <magnus@hagander.net> writes:
> On Tue, Nov 10, 2015 at 6:15 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I don't know anything about jpdftweak, but if it's being used to get rid
>> of unreferenced hyperlink anchors, maybe we could dispense with that step
>> after this goes in.
> Yeah, that's what I was hoping. You can see how it's used in the
> mk-release-pdfs script on borka.
Hmm ... building current HEAD in A4 format, I get
HEAD with my patch
initially generated PDF: 26.30MB 13.25MB
after jpdftweak: 7.24MB 7.24MB
Evidently, jpdftweak *is* removing unreferenced bookmarks --- the output
file sizes would not be so close to identical otherwise. But it's
evidently doing more than that. The initially generated PDFs are
fairly compressible by "gzip", while jpdftweak's outputs are not, so
I suppose that the additional savings come from applying compression.
jdftweak's help output indicates that the "-ocs" options are selecting
aggressive compression.
I tried removing the load/save bookmarks steps from mk-release-pdfs,
but what I get is files that are a little smaller yet and again almost the
same size for either starting point; that probably means that jpdftweak's
default behavior is to strip all bookmarks :-(.
Maybe we could look around for another tool that just does PDF compression
and not the other stuff ...
regards, tom lane
