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 16:41:13 +0300 Message-ID: <83zi9wkrk6.fsf@gnu.org> References: <83mv5xm84m.fsf@gnu.org> <874ls5xdzz.fsf@udel.edu> <20170914202312.GA1870@holos.localdomain> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1505482914 5793 195.159.176.226 (15 Sep 2017 13:41:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 15 Sep 2017 13:41:54 +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 15:41:49 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 1dsqsO-0001J9-LQ for ged-emacs-devel@m.gmane.org; Fri, 15 Sep 2017 15:41:48 +0200 Original-Received: from localhost ([::1]:53441 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqsU-0001lt-QN for ged-emacs-devel@m.gmane.org; Fri, 15 Sep 2017 09:41:54 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:49297) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqru-0001ki-Bp for emacs-devel@gnu.org; Fri, 15 Sep 2017 09:41:19 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dsqrs-0005qi-1Y for emacs-devel@gnu.org; Fri, 15 Sep 2017 09:41:18 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:32923) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dsqrr-0005qW-Ut; Fri, 15 Sep 2017 09:41:15 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3389 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1dsqrp-0007qp-Uv; Fri, 15 Sep 2017 09:41:15 -0400 In-reply-to: <20170914202312.GA1870@holos.localdomain> (message from Mark Oteiza on Thu, 14 Sep 2017 16:23:12 -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:218323 Archived-At: > Date: Thu, 14 Sep 2017 16:23:12 -0400 > From: Mark Oteiza > Cc: emacs-devel@gnu.org > > On 14/09/17 at 03:43pm, Mark Oteiza wrote: > > + Lisp_Object rgb1 = list3 (make_number (&cdef1.red), > > + make_number (&cdef1.green), > > + make_number (&cdef1.blue)); > > + Lisp_Object rgb2 = list3 (make_number (&cdef2.red), > > + make_number (&cdef2.green), > > + make_number (&cdef2.blue)); > > I guess these need RGB values to be shifted? Why? color_distance only shifts them because it wants to work on 8-bit color components, but you want 16-bit components, AFAIU.