From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/15816 Path: main.gmane.org!not-for-mail From: Brooks Moses Newsgroups: gmane.comp.tex.context Subject: Re: ConTeXt output & commercial printing houses: Thanks! Date: Mon, 26 Jul 2004 23:33:03 -0700 Sender: ntg-context-bounces@ntg.nl Message-ID: <4.3.1.2.20040726232423.017f84f8@cits1.stanford.edu> References: <002101c4723f$58ae2390$fcb359d5@DJCPX90J> <20040725125830.14364@news.comp.lancs.ac.uk> <001501c4722e$4ca1f100$fcb359d5@DJCPX90J> <0A30D0B7-DE21-11D8-9127-0030659899AA@fiee.net> <20040724202504.GA9909@muisje> <20040724152139.36ca8b80@atipa.local> <20040725125830.14364@news.comp.lancs.ac.uk> <20040724194138.GG18318@swordfish> <001501c4722e$4ca1f100$fcb359d5@DJCPX90J> <20040724194138.GG18318@swordfish> <0A30D0B7-DE21-11D8-9127-0030659899AA@fiee.net> <20040724194138.GG18318@swordfish> <20040724152139.36ca8b80@atipa.local> <20040724202504.GA9909@muisje> <20040724194138.GG18318@swordfish> <20040724152139.36ca8b80@atipa.local> <20040727061509.GB17632@swordfish> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Trace: sea.gmane.org 1090910112 25827 80.91.224.253 (27 Jul 2004 06:35:12 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 27 Jul 2004 06:35:12 +0000 (UTC) Original-X-From: ntg-context-bounces@ntg.nl Tue Jul 27 08:35:02 2004 Return-path: Original-Received: from ronja.vet.uu.nl ([131.211.172.88] helo=ronja.ntg.nl) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1BpLYE-0003UD-00 for ; Tue, 27 Jul 2004 08:35:02 +0200 Original-Received: from localhost (localhost.localdomain [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 038121277F; Tue, 27 Jul 2004 08:35:02 +0200 (CEST) Original-Received: from ronja.ntg.nl ([127.0.0.1]) by localhost (ronja.vet.uu.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 08224-01; Tue, 27 Jul 2004 08:35:01 +0200 (CEST) Original-Received: from ronja.vet.uu.nl (localhost.localdomain [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 3031512772; Tue, 27 Jul 2004 08:33:19 +0200 (CEST) Original-Received: from localhost (localhost.localdomain [127.0.0.1]) by ronja.ntg.nl (Postfix) with ESMTP id 0C74312772 for ; Tue, 27 Jul 2004 08:33:18 +0200 (CEST) Original-Received: from ronja.ntg.nl ([127.0.0.1]) by localhost (ronja.vet.uu.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 07993-07 for ; Tue, 27 Jul 2004 08:33:17 +0200 (CEST) Original-Received: from smtp3.Stanford.EDU (unknown [171.67.16.138]) by ronja.ntg.nl (Postfix) with ESMTP id 22BF01276B for ; Tue, 27 Jul 2004 08:33:16 +0200 (CEST) Original-Received: from Brooks1.stanford.edu (DNab42a4d5.Stanford.EDU [171.66.164.213]) by smtp3.Stanford.EDU (8.12.11/8.12.11) with ESMTP id i6R6XDfW023141 for ; Mon, 26 Jul 2004 23:33:14 -0700 X-Sender: brooks@cits1.stanford.edu X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Original-To: mailing list for ConTeXt users In-Reply-To: <20040727061509.GB17632@swordfish> Original-References: <002101c4723f$58ae2390$fcb359d5@DJCPX90J> <20040725125830.14364@news.comp.lancs.ac.uk> <001501c4722e$4ca1f100$fcb359d5@DJCPX90J> <0A30D0B7-DE21-11D8-9127-0030659899AA@fiee.net> <20040724202504.GA9909@muisje> <20040724152139.36ca8b80@atipa.local> <20040725125830.14364@news.comp.lancs.ac.uk> <20040724194138.GG18318@swordfish> <001501c4722e$4ca1f100$fcb359d5@DJCPX90J> <20040724194138.GG18318@swordfish> <0A30D0B7-DE21-11D8-9127-0030659899AA@fiee.net> <20040724194138.GG18318@swordfish> <20040724152139.36ca8b80@atipa.local> <20040724202504.GA9909@muisje> <20040724194138.GG18318@swordfish> <20040724152139.36ca8b80@atipa.local> X-Virus-Scanned: by amavisd-new at ntg.nl X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.5 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 X-Virus-Scanned: by amavisd-new at ntg.nl Xref: main.gmane.org gmane.comp.tex.context:15816 X-Report-Spam: http://spam.gmane.org/gmane.comp.tex.context:15816 At 11:15 PM 7/26/2004, you wrote: >On Sat, Jul 24, 2004 at 03:21:39PM -0500, Bill McClain wrote: > > - Also, I don't know whether it is possible to downsample images in > > PDF's that you generate from ConTeXt. If it is, avoid it. > >That raises an important question: if downsampling is done, is it >obvious what ConTeXt commands cause it to happen? There's, to my knowledge, no engine in pdfTeX for downsampling images; there certainly be one coded in ConTeXt. Thus, I'd be fairly confident in guessing that it is indeed, fairly obvious, on grounds that there are no commands which do that. > > The printer > > expects CMYK images (not RGB!) where the resolution is approx. 2 times > > the screen count in the final print, @ the physical size on the paper. > > So if you have an image in your PDF that is 10 cms /4 in. wide, and you > > want it printed in a 150 lpi (lines per inch) screen, make sure the > > original resolution is 300 dpi @ 10 cms / 4 in. > >Now that's interesting. I imagined you would get the best results with >images that were designed exactly at the printer resolution. You might, but that would only be true if you also have the image aligned exactly with the printer resolution -- which is unlikely to be the case unless you do it explicitly. Having the 2x-or-higher resolution means that the downsampling in the printing process will produce an acceptable result no matter what the alignment is. Beyond that, I suspect there are also some effects involved in the fact that the printer is creating a screen rather than dots of pure color; there are things going on in the screen that are on a finer scale than the line spacing, and having the higher-resolution to base them on probably produces a better result. - Brooks