From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/87997 Path: news.gmane.org!not-for-mail From: Hans Hagen Newsgroups: gmane.comp.tex.context Subject: Re: underbraces get progressively more misaligned (w/ minimal example) Date: Fri, 04 Jul 2014 00:51:23 +0200 Message-ID: <53B5DE6B.8040104@wxs.nl> References: <87d2dsnhui.fsf@approx.mit.edu> <877g40nhcl.fsf@approx.mit.edu> <87k37u7m4e.fsf@approx.mit.edu> <66D45391-7643-4952-BF98-7439FCEC856B@gmail.com> <87a98q40ks.fsf@approx.mit.edu> <53B5D497.1040108@wxs.nl> <871tu23w7e.fsf@approx.mit.edu> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1404427915 28462 80.91.229.3 (3 Jul 2014 22:51:55 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 3 Jul 2014 22:51:55 +0000 (UTC) To: Sanjoy Mahajan , Wolfgang Schuster , mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Fri Jul 04 00:51:50 2014 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from balder.ntg.nl ([5.39.185.229]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X2pr3-0003Gx-Vw for gctc-ntg-context-518@m.gmane.org; Fri, 04 Jul 2014 00:51:50 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id B67721021B for ; Fri, 4 Jul 2014 00:51:49 +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 IWbelOyo0yo8 for ; Fri, 4 Jul 2014 00:51:49 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [IPv6:::1]) by balder.ntg.nl (Postfix) with ESMTP id ACEEE10225 for ; Fri, 4 Jul 2014 00:51:41 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 1DA47101E8 for ; Fri, 4 Jul 2014 00:51:37 +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 vPZ3rjRV8pcS for ; Fri, 4 Jul 2014 00:51:31 +0200 (CEST) Original-Received: from filter3-ams.mf.surf.net (filter3-ams.mf.surf.net [192.87.102.71]) by balder.ntg.nl (Postfix) with ESMTP id 72F65101E7 for ; Fri, 4 Jul 2014 00:51:25 +0200 (CEST) Original-Received: from smtp.ziggozakelijk.nl (D57D1DA2.static.ziggozakelijk.nl [213.125.29.162]) by filter3-ams.mf.surf.net (8.14.3/8.14.3/Debian-9.4) with ESMTP id s63MpPLQ012335 for ; Fri, 4 Jul 2014 00:51:25 +0200 X-Default-Received-SPF: pass (skip=loggedin (res=PASS)) x-ip-name=10.100.1.104; Original-Received: from [10.100.1.104] (unverified [10.100.1.104]) by pragma-net.nl (SurgeMail 6.5a2) with ESMTP id 9361-1713362 for multiple; Fri, 04 Jul 2014 00:51:23 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 In-Reply-To: <871tu23w7e.fsf@approx.mit.edu> X-Authenticated-User: hagen@controller-9 X-Bayes-Prob: 0.0001 (Score 0, tokens from: ntg-context@ntg.nl, base:default, @@RPTN) X-CanIt-Geo: ip=213.125.29.162; country=NL; region=Provincie Overijssel; city=Zwolle; latitude=52.5058; longitude=6.0858; http://maps.google.com/maps?q=52.5058,6.0858&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 03MlWPpX6 - e76009e9a3e5 - 20140704 (trained as not-spam) X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.71 X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.14 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ntg-context-bounces@ntg.nl Original-Sender: ntg-context-bounces@ntg.nl Xref: news.gmane.org gmane.comp.tex.context:87997 Archived-At: On 7/4/2014 12:37 AM, Sanjoy Mahajan wrote: >> context --make does a --generate so you can skip that and the luatools >> run is not needed either (selfupdate is seldom needed too) > > So 'context --make' is all one needs? I'll update the wiki. > >> we get a .5pt height difference somewhere (nothing else different in a >> trace) ... smells like a luatex bug (testing that now) > > That is my suspicion as well. But I couldn't reproduce it with plain > luatex. Though maybe I needed to use equation numbers, however that is > done in plain tex (the context run doesn't show the problem without the > \placeformula). > > I suspect some internal state is getting slightly corrupted and getting > progressively worse with the 30,000 repetitions. here it happens after a pagebreak (a few lines overflow are ok) > I've been finding many unexplained 0.5pt or so differences, which may be > related to the underbrace problem. The context, so to speak, is that I > am putting in the last edits to the book, after having gone through and > checked every page many times. So I want to ensure that none of the > small changes has a big effect, but I don't want to check every page > again (or I'll vomit). > > Thus, I run my compare-pdfs.sh script on the previous and the latest > pdf. It renders each page to a B/W png (using mupdf) and then compares > corresponding pages using 'compare' (one of the ImageMagick tools). Any > differing pixels are in red, and the shared pixels are in very light > gray. Then all the pages with enough differences are viewed with 'feh', > in order of most-to-least differences. And I check that nothing major > has changed. > > What I keep finding is that pages long after where I make a small change > somehow get changed, with roughly one-pixel shifts to parts of the page. > I'm attaching an example pixel diff. It shows changes on p.72 of the > mss. However, the only change to the source code was on p.58 (and was > designed not to change any page breaks, which it didn't). That same > page (p.72) often gets similar changes with all kinds of small changes. > > [Note to me: In case I need to recreate the source for debugging > purposes, it's the change from rev 41ff54 to 2467d5] > > In case the script is useful to others (earlier versions are in the > contexttest repository somewhere), I am attaching it. I use it as > follows with a bash command line. (The awk in the pipeline makes sure > that only pages with some difference make it to the viewer.) > > DPI=72 compare-pdfs.sh old.pdf new.pdf | tee book-print.compare72dpi | awk '{if (($3 > 0.02)) print;}' | sort -nr -k3 | awk '{print $1}' | xargs -r feh > > -Sanjoy > -- ----------------------------------------------------------------- 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 ___________________________________________________________________________________