From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/71919 Path: news.gmane.org!not-for-mail From: Hans Hagen Newsgroups: gmane.comp.tex.context Subject: Re: Image compression/resizing in PDFs Date: Mon, 24 Oct 2011 15:46:12 +0200 Message-ID: <4EA56C24.2000802@wxs.nl> References: <87aa8uk6tz.fsf@devereux.me.uk> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1319464002 10300 80.91.229.12 (24 Oct 2011 13:46:42 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 24 Oct 2011 13:46:42 +0000 (UTC) Cc: John Devereux To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Mon Oct 24 15:46:37 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 1RIKrN-000588-8k for gctc-ntg-context-518@m.gmane.org; Mon, 24 Oct 2011 15:46:37 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 52609CB097; Mon, 24 Oct 2011 15:46:36 +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 R-HoQ9Kqa+3h; Mon, 24 Oct 2011 15:46:30 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 1696DCB08C; Mon, 24 Oct 2011 15:46:30 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id BB543CB08C for ; Mon, 24 Oct 2011 15:46:28 +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 ThdSGqlgqYMH for ; Mon, 24 Oct 2011 15:46:23 +0200 (CEST) Original-Received: from filter4-nij.mf.surf.net (filter4-nij.mf.surf.net [195.169.124.155]) by balder.ntg.nl (Postfix) with ESMTP id D1811CB04C for ; Mon, 24 Oct 2011 15:46:23 +0200 (CEST) Original-Received: from smtp.ziggozakelijk.nl (D57D1DA2.static.ziggozakelijk.nl [213.125.29.162]) by filter4-nij.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id p9ODkKXR021093 for ; Mon, 24 Oct 2011 15:46:21 +0200 X-Default-Received-SPF: pass (skip=loggedin (res=PASS)) x-ip-name=10.100.1.100; Original-Received: from [10.100.1.100] (unverified [10.100.1.100]) by pragma-net.nl (SurgeMail 5.3h2) with ESMTP (TLS) id 1420-1713362 for multiple; Mon, 24 Oct 2011 15:46:11 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 In-Reply-To: <87aa8uk6tz.fsf@devereux.me.uk> X-Authenticated-User: hagen@controller-9 X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=213.125.29.162; country=NL; region=11; city=Den Haag; latitude=52.0833; longitude=4.3000; http://maps.google.com/maps?q=52.0833,4.3000&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 04FMBKk9C - 435ce76bd09a - 20111024 X-Scanned-By: CanIt (www . roaringpenguin . com) on 195.169.124.155 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:71919 Archived-At: On 21-10-2011 11:54, John Devereux wrote: > > Hi all, > > Is there a way to have context automatically compress or resample > included images to a given output resolution? I have not been following > recent developments... > > I can obviously "pre-reduce" all images to the desired dpi. But: > > 1) This is a bit of work (and hard to get non-technical people to do) > > 2) In 5 years time we might want the images to be higher resolution and > not be as concerned about PDF size. But the information will be lost (or > be elsewhere). > > So a command line or document setting would be ideal, is there such a > thing? \setpdfimageresolution[300dpi]. You can plug in a converter: \startluacode figures.converters["png"] = { ["lowres.png"] = function(oldname,newname,resolution) os.execute(string.format('gm convert -depth 1 "%s" "%s"',oldname,newname)) end, } -- the following is automatic in next beta figures.suffixes["lowres.png"] = figures.suffixes.png \stopluacode And then use: \starttext \externalfigure[mill.png][conversion=lowres.png] \stoptext downsamples images are cached so the overhead is minimal Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl ----------------------------------------------------------------- ___________________________________________________________________________________ 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 ___________________________________________________________________________________