From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/68738 Path: news.gmane.org!not-for-mail From: Peter Rolf Newsgroups: gmane.comp.tex.context Subject: Re: compresslevel and png graphics (mkiv) Date: Thu, 26 May 2011 12:52:00 +0200 Message-ID: <4DDE30D0.9040204@gmx.net> References: <4DDCF96A.3050703@gmx.net> <4DDD14BC.40203@wxs.nl> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1306407149 26889 80.91.229.12 (26 May 2011 10:52:29 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 26 May 2011 10:52:29 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Thu May 26 12:52:24 2011 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from balder.ntg.nl ([195.12.62.10]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1QPYAw-0006z4-11 for gctc-ntg-context-518@m.gmane.org; Thu, 26 May 2011 12:52:22 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id E093ACAD66; Thu, 26 May 2011 12:52:20 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id HVS34RLayX6M; Thu, 26 May 2011 12:52:18 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 7F882CAD59; Thu, 26 May 2011 12:52:18 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 22918CAD59 for ; Thu, 26 May 2011 12:52:18 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id WANfK68zCF68 for ; Thu, 26 May 2011 12:52:06 +0200 (CEST) Original-Received: from filter1-ams.mf.surf.net (filter1-ams.mf.surf.net [192.87.102.69]) by balder.ntg.nl (Postfix) with ESMTP id D2ABECAD3A for ; Thu, 26 May 2011 12:52:06 +0200 (CEST) Original-Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.23]) by filter1-ams.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with SMTP id p4QAq58B027900 for ; Thu, 26 May 2011 12:52:06 +0200 Original-Received: (qmail invoked by alias); 26 May 2011 10:52:04 -0000 Original-Received: from ip-109-90-194-239.unitymediagroup.de (EHLO [192.168.178.3]) [109.90.194.239] by mail.gmx.net (mp003) with SMTP; 26 May 2011 12:52:04 +0200 X-Authenticated: #24293357 X-Provags-ID: V01U2FsdGVkX198FD4nw118uH9yFp8F03bFm0YKMsubhc+K8uqROX UQcSCHAjjY43hZ User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Mnenhy/0.8.3 Thunderbird/3.1.10 In-Reply-To: X-Enigmail-Version: 1.1.1 X-Y-GMX-Trusted: 0 X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=213.165.64.23; country=DE; latitude=51.0000; longitude=9.0000; http://maps.google.com/maps?q=51.0000,9.0000&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 06EMaQ6jm - ee79019f6f6a - 20110526 X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.69 X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.12 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: ntg-context-bounces@ntg.nl Errors-To: ntg-context-bounces@ntg.nl Xref: news.gmane.org gmane.comp.tex.context:68738 Archived-At: 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? > Another factor influencing the size is if it's PDF-1.4 or PDF-1.5: If > you have a 16 bit PNG, for PDF-1.4 it will be automatically reduced to 8 > bit by luatex and pdftex, so suddenly the PDF file gets smaller, but > actually also the image quality (silently) went down. > > These are about the factors affecting the PNG to PDF size. For your big > PNG graphic you may find a preprocessing (e. g., pngtopnm | pnmtopng > will definitely remove all fat) that makes it compliant with the "PNG > copy". > I will give that a try. But I doubt that there is much 'fat' on that graphic. Anyhow, you never know before you have tried it. :-) Thanks Hartmut for the very detailed and interesting answer. Regards, Peter >> Otherwise the time consuming usage of optipng would be a complete >> waste of time. Believe it or not, but size matters :-) > > yes :-) > >> This one is for Hartmut to answer. Keep in mind that pdf does support >> pgn and jpg compression, which is not the same as 'inclusion as-is'. > > fwiw, jpg is always embedded literally (no re-compression). > >> The compresslevel concerns copyright free zip compression of streams >> (that can happen to gave image data). > > Regards, Hartmut > ___________________________________________________________________________________ > 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 > ___________________________________________________________________________________ > ___________________________________________________________________________________ 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 ___________________________________________________________________________________