From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Doc string and operation of color-distance Date: Fri, 15 Sep 2017 16:40:00 +0300 Message-ID: <831sn8m66n.fsf@gnu.org> References: <83mv5xm84m.fsf@gnu.org> <874ls5xdzz.fsf@udel.edu> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1505482836 30673 195.159.176.226 (15 Sep 2017 13:40:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 15 Sep 2017 13:40:36 +0000 (UTC) Cc: emacs-devel@gnu.org To: Mark Oteiza Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Sep 15 15:40:29 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dsqr6-0007iP-Od for ged-emacs-devel@m.gmane.org; Fri, 15 Sep 2017 15:40:28 +0200 Original-Received: from localhost ([::1]:53439 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqrA-0001EQ-EF for ged-emacs-devel@m.gmane.org; Fri, 15 Sep 2017 09:40:32 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48733) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqqz-0001DH-Cr for emacs-devel@gnu.org; Fri, 15 Sep 2017 09:40:22 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dsqqt-0005Jf-I6 for emacs-devel@gnu.org; Fri, 15 Sep 2017 09:40:21 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:32886) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqqt-0005Jb-FI; Fri, 15 Sep 2017 09:40:15 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3388 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1dsqqr-0007jc-Cz; Fri, 15 Sep 2017 09:40:15 -0400 In-reply-to: <874ls5xdzz.fsf@udel.edu> (message from Mark Oteiza on Thu, 14 Sep 2017 15:43:28 -0400) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:218322 Archived-At: > From: Mark Oteiza > Date: Thu, 14 Sep 2017 15:43:28 -0400 > Cc: emacs-devel@gnu.org > > At the very least we should feed metrics the translated RGBs. Yes. But it would be nicer if the lcms.c functions accepted colors in any form supported by Emacs: a color name, a string RGB spec, or a list of RGB values. I think. > Beyond that, in order to use (for example) lcms2-cam02-ucs with > color-distance, one has to translate RGB to XYZ, so the metric would be > > (lambda (a b) > (lcms2-cam02-ucs (color-srgb-to-xyz a) (color-srgb-to-xyz b)) color-srgb-to-xyz accepts 3 arguments, not one. Also, its doc string says the components are floats between 0 and 1. So this should be amended accordingly.