On Thu, May 26, 2011 at 12:52 PM, Peter Rolf <indi...@gmx.net> wrote: > Am 25.05.2011 21:54, schrieb Hartmut Henkel: >> On Wed, 25 May 2011, Hans Hagen wrote: >>> On 25-5-2011 2:43, Peter Rolf wrote: >>>> >>>> I just made a one pager (TEXpage) out of a big png graphic >>>> (5900x4094). The compressed size of the graphics is normally around >>>> 1.37MB on the highest png compress level (9) and 1.32MB after using >>>> optipng (only around 3% reduction this time). To my surprise the >>>> size of the final PDF was about 2.3MB. After adding >>>> '\pdfcompresslevel9' the size went down to 1.48MB. Still not what I >>>> wanted... >>>> >>>> So I was wondering: is there an option to embed the png graphic as >>>> it is (no re-compression)? >> >> no. There is a "PNG Copy" function for literal embedding of the PNG >> file, but that triggers only, if the file simultaneously satisfies quite >> a few conditions, which are about: non-interlaced, no palette, no >> transparency, no gamma coming with it, no gamma modification requested, >> no white adjustment in the PNG, and a few more rare others. Else it's >> de-compressed and then re-compressed to the \pdfcompresslevel, and >> additional streams and dicts are added. You see in the log if it finally >> was "PNG Copy" or not. >> > Sigh, most of my graphics use (and need) transparency. > So the only advantage I get from optipng is the smaller file size on my > disk. Sad, but good to know. ;-) > >> Preprocessing the PNG, e. g., by convert, sometimes changes it that it >> gets copyable. Obviously flattening transparency also helps. >> >> Anyway direct embedding or not can have positive or negative influence >> on the PDF file size. E. g. if a PNG is copied verbatim, and it contains >> lots of meta-data info, the PDF file will probably get larger, since >> normal PNG embedding removes all these info chunks. >> > And what about icc profiles? removed, I suppose. Not really a big problem, and doable in mkiv (see Hacked image color space. in texmf-dist/doc/pdftex/manual/samplepdf of a recent texlive)
-- luigi ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
