From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/69283 Path: news.gmane.org!not-for-mail From: Christoph Redecker Newsgroups: gmane.comp.tex.context Subject: Re: Colors: printing vs. on screen Date: Sun, 19 Jun 2011 14:08:41 +0200 Message-ID: <4DFDE6C9.6070300@tu-harburg.de> References: 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 1308485336 31676 80.91.229.12 (19 Jun 2011 12:08:56 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sun, 19 Jun 2011 12:08:56 +0000 (UTC) To: ntg-context@ntg.nl Original-X-From: ntg-context-bounces@ntg.nl Sun Jun 19 14:08:52 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 1QYGo8-00006f-12 for gctc-ntg-context-518@m.gmane.org; Sun, 19 Jun 2011 14:08:52 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 98931CADDF; Sun, 19 Jun 2011 14:08:51 +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 ED6jt-5jO+o7; Sun, 19 Jun 2011 14:08:39 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id D6C55CADDC; Sun, 19 Jun 2011 14:08:39 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id E5CFBCADDC for ; Sun, 19 Jun 2011 14:08:38 +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 6L+bLxU36Rlh for ; Sun, 19 Jun 2011 14:08:37 +0200 (CEST) Original-Received: from filter2-ams.mf.surf.net (filter2-ams.mf.surf.net [192.87.102.70]) by balder.ntg.nl (Postfix) with ESMTP id 072B4CADDA for ; Sun, 19 Jun 2011 14:08:37 +0200 (CEST) Original-Received: from smtp3.rz.tu-harburg.de (smtp3.rz.tu-harburg.de [134.28.202.138]) by filter2-ams.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id p5JC8Zjr021154 for ; Sun, 19 Jun 2011 14:08:36 +0200 Original-Received: from mail.tu-harburg.de (mail.tu-harburg.de [134.28.202.179]) by smtp3.rz.tu-harburg.de (8.13.8/8.13.8) with ESMTP id p5JC8ZB8019235 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Sun, 19 Jun 2011 14:08:35 +0200 Original-Received: from [192.168.2.146] (f054096187.adsl.alicedsl.de [78.54.96.187]) (user=ttcr mech=PLAIN bits=0) by mail.tu-harburg.de (8.13.8/8.13.8) with ESMTP id p5JC8YV6011757 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Sun, 19 Jun 2011 14:08:35 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tu-harburg.de; s=x2011-24; t=1308485315; bh=3s0Znqd38jfjmtgyPaYRrzL0ArQx7IN6Vx/nz2irIT4=; h=Message-ID:Date:From:MIME-Version:To:Subject:References: In-Reply-To:Content-Type:Content-Transfer-Encoding; b=sHjxSPLT0zorrArsqBYauVFLnusA7Sz5/Om/nN7phwk7eu21S3XN6AMVEpmn64JO6 nXlf5KMsmNj53PC4e9mKfTI9bAdh9tSCzJMBEsaPLMadK58gFDFLn1O8mwMdxdIHKy 72/dRBheIXGNCNDTIMfQRIsIfHMMNAuk13p2uc54= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 In-Reply-To: X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.70 X-Scanned-By: TUHH Rechenzentrum content checker on 134.28.202.138 X-Scanned-By: TUHH Rechenzentrum content checker on 134.28.202.179 X-Bayes-Prob: 0.0124 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=134.28.202.138; country=DE; region=04; city=Hamburg; latitude=53.5500; longitude=10.0000; http://maps.google.com/maps?q=53.5500,10.0000&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0rEVM8AnL - 5df3c29a2c6d - 20110619 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:69283 Archived-At: > -- Are "spot colors" the thing to use to get a grip on these matters? No, because spot colors are used to extend the printable range by colors not available in cmyk. You might be able to show such a color on your monitor, but not print it. > -- Is this generally only a matter of "color spaces" and > transformations between them? Yes, because your monitor uses RGB and your printer uses CMYK. The conversion between thetwo is not too complicated, but actually getting the same output from the two is hard. RGB is an additive model, CMYK is subtractive (read about the different models, wikipedia will do). The color impression you get by looking at the output is generated in completely different ways. or ... > -- Is this also dependent on specific printer models (eg. different > office laser printers)? > -- If yes, is there any source on information on the pecularities > of these printers? Each printer will print slightly different, that's the nature of things. Your best bet is to calibrate your monitor (also, search a bit on the web for ways to do this). Turn a few of your monitors knobs and see how the colors change - now imagine what variables come into play between your impression of the color shown by your monitor, the actual data, and the impression you get from your printer's output! You can also try specifying a color in CMYK and see if the output changes. Regards Christoph ___________________________________________________________________________________ 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 ___________________________________________________________________________________