From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/69624 Path: news.gmane.org!not-for-mail From: Taco Hoekwater Newsgroups: gmane.comp.tex.context Subject: Re: CMYK colors not as expected Date: Wed, 29 Jun 2011 15:59:23 +0200 Message-ID: <4E0B2FBB.9080000@elvenkind.com> 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" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1309355988 7003 80.91.229.12 (29 Jun 2011 13:59:48 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 29 Jun 2011 13:59:48 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Wed Jun 29 15:59:44 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 1QbvIt-00057B-Th for gctc-ntg-context-518@m.gmane.org; Wed, 29 Jun 2011 15:59:43 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id F1796CAE0A; Wed, 29 Jun 2011 15:59:42 +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 ap5jnrnS4m9d; Wed, 29 Jun 2011 15:59:40 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 70510CAE2F; Wed, 29 Jun 2011 15:59:40 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 5126DCAE2F for ; Wed, 29 Jun 2011 15:59:39 +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 M4Jg8jZQYG3U for ; Wed, 29 Jun 2011 15:59:25 +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 29E16CAE0A for ; Wed, 29 Jun 2011 15:59:25 +0200 (CEST) Original-Received: from pilot.elvenkind.com (elvenknd.xs4all.nl [82.95.203.226]) by filter2-ams.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id p5TDxOgj027644 for ; Wed, 29 Jun 2011 15:59:24 +0200 Original-Received: from localhost (pilot.elvenkind.com [127.0.0.1]) by pilot.elvenkind.com (Postfix) with ESMTP id D295D8F2; Wed, 29 Jun 2011 15:56:05 +0200 (CEST) X-Virus-Scanned: amavisd-new at localhost.localdomain Original-Received: from pilot.elvenkind.com ([127.0.0.1]) by localhost (pilot.elvenkind.com [127.0.0.1]) (amavisd-new, port 10025) with LMTP id RaLjH92gDD+D; Wed, 29 Jun 2011 15:56:05 +0200 (CEST) Original-Received: from glenlivet.elvenkind.com (glenlivet.elvenkind.com [10.10.0.6]) by pilot.elvenkind.com (Postfix) with ESMTP id 2EC8D161; Wed, 29 Jun 2011 15:56:05 +0200 (CEST) User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.14) Gecko/20101022 Mandriva/3.0.9-0.1mdv2010.1 (2010.1) Thunderbird/3.0.9 In-Reply-To: X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=82.95.203.226; country=NL; region=11; city=Capelle; latitude=51.9333; longitude=4.5833; http://maps.google.com/maps?q=51.9333,4.5833&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0rF1NXo5d - c8ab8b4702c8 - 20110629 X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.70 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:69624 Archived-At: On 06/29/11 08:08, luigi scarso wrote: > > > have you already seen > http://en.wikipedia.org/wiki/YCbCr As luigi says, the Y/Cb/Cr (with or without T) is not CMYK, it is a different kind of color space altogether, and is conceptually much closer to RGB than to CMYK. The wiki page has equations to convert YCbCr to RGB. I have no idea what the 'K' component in your CLUT is supposed to be. Best wishes, Taco ___________________________________________________________________________________ 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 ___________________________________________________________________________________