From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/68785 Path: news.gmane.org!not-for-mail From: Peter Rolf Newsgroups: gmane.comp.tex.context Subject: Re: compresslevel and png graphics (mkiv) Date: Fri, 27 May 2011 17:11:53 +0200 Message-ID: <4DDFBF39.9070100@gmx.net> References: <4DDCF96A.3050703@gmx.net> <4DDD14BC.40203@wxs.nl> <4DDE30D0.9040204@gmx.net> <4DDE7D0F.3030002@gmx.net> <4DDF91BF.8030806@gmx.net> <20110527130914.171040@gmx.net> 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 1306509140 17055 80.91.229.12 (27 May 2011 15:12:20 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 27 May 2011 15:12:20 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Fri May 27 17:12:16 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 1QPyhz-0001nF-E7 for gctc-ntg-context-518@m.gmane.org; Fri, 27 May 2011 17:12:15 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 3920ACAD2E; Fri, 27 May 2011 17:12:14 +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 J0RhHTRhGPvs; Fri, 27 May 2011 17:12:11 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 743AFCAD2F; Fri, 27 May 2011 17:12:11 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 34C39CAD2F for ; Fri, 27 May 2011 17:12:10 +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 ZWNKXdSuq+Ne for ; Fri, 27 May 2011 17:12:08 +0200 (CEST) Original-Received: from filter2-til.mf.surf.net (filter2-til.mf.surf.net [194.171.167.218]) by balder.ntg.nl (Postfix) with ESMTP id 51E87CAD2E for ; Fri, 27 May 2011 17:12:08 +0200 (CEST) Original-Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.22]) by filter2-til.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with SMTP id p4RFC7qR014619 for ; Fri, 27 May 2011 17:12:07 +0200 Original-Received: (qmail invoked by alias); 27 May 2011 15:12:07 -0000 Original-Received: from ip-109-90-194-239.unitymediagroup.de (EHLO [192.168.178.3]) [109.90.194.239] by mail.gmx.net (mp024) with SMTP; 27 May 2011 17:12:07 +0200 X-Authenticated: #24293357 X-Provags-ID: V01U2FsdGVkX19ZgGpHEolZ7J5f/AwbpXDmaLit/xfKhUP8lXl93W hJ/VjdB4zgPdeH 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: <20110527130914.171040@gmx.net> 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=213.165.64.22; 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: 0bEMDc76M - 2a543f41b947 - 20110527 X-Scanned-By: CanIt (www . roaringpenguin . com) on 194.171.167.218 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:68785 Archived-At: Am 27.05.2011 15:09, schrieb Hartmut Henkel: >>> @luigi: an ICC profile definitely breaks the rules >>> >>> The only chunks left are >>> >>> IHDR PNG image header: 5900x4094, 8bits/sample, truecolor, >> noninterlaced >>> IDAT PNG image data >>> .. >>> IDAT PNG image data >>> IEND end-of-image marker >>> >>> Mh, where is the show stopper? The compression method? >>> >> Looks like some of ConTeXt PDF/X-related settings is causing this. If I >> reduce the code to the pure picture, the '(PNG copy)' is triggered. >> Probably the active color management (default color space) is breaking >> the copy process here. > Sorry Hartmut, my last statement is complete BS. I made a 'blind' run in my lunch break, not inspecting the pdf. And sadly I had forgotten, that I changed the test file yesterday to use a small png test graphic instead of my big png. *brain vs. full stomach: 0:1* So the PDF/X settings have no influence on this. The big png is not 'copied'. Anyhow, this is not a serious problem and honestly I don't have that much time now. When I have some more time I will use gdb to find the failing condition in writepng.w. Will be interesting, the last time I used gdb is more than 10 years ago. Thanks for all answers so far. Regards, Peter > must be some \pdfimageapplygamma > 0, only this and the \pdfimagehicolor > primitive can influence this low level stuff. > > Btw, just \pdfimageapplygamma > 0 (without setting \pdfgamma and \pdfimagegamma) already changes the PNG image, since the luatex (and pdftex) internal defaults are not gamma-neutral. No idea if (and then > to which value) this should be fixed. > > 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 ___________________________________________________________________________________