From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#41544: 26.3; Possible incorrect results from color-distance Date: Sun, 07 Jun 2020 17:30:04 +0300 Message-ID: <83zh9f6j9v.fsf@gnu.org> References: <5C4A633D-8222-4439-BE37-9B8674F1DA6D@acm.org> <87r1v2aat3.fsf@tromey.com> <9902865C-01B4-4E50-A433-DBC8B8311234@acm.org> <83tuzueogo.fsf@gnu.org> <6272275C-560C-4437-90F1-2A8294D27019@acm.org> <83o8q2elja.fsf@gnu.org> <83mu5mel4o.fsf@gnu.org> <77F1DDD3-A69F-40ED-902D-74986D5E6596@acm.org> <83y2p5cumz.fsf@gnu.org> <83blm0cjlz.fsf@gnu.org> <83367ccf8w.fsf@gnu.org> <624D7FB8-A836-4A7E-8895-47E867214504@acm.org> <83o8pyc4bq.fsf@gnu.org> <55D73CA5-1EFB-4B0A-8F8B-FDA1D39F51BF@acm.org> <835zc5bsut.fsf@gnu.org> <3BBCFDD4-C14D-4628-91CB-2A0456A96FC7@acm.org> <838sh0abzz.fsf@gnu.org> <83r1us8kw6.fsf@gnu.org> <020DE875-14A8-457A-9AE4-AA0925DB8997@acm.org> <83img48ffx.fsf@gnu.org> <5AEB442C-5592-46E4-BC38-185BA9D2D956@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="125948"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 41544@debbugs.gnu.org To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jun 07 16:31:12 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jhwKO-000WiZ-Ge for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 07 Jun 2020 16:31:12 +0200 Original-Received: from localhost ([::1]:56752 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jhwKN-0004Fq-IH for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 07 Jun 2020 10:31:11 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:32780) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jhwKG-0004Fj-1J for bug-gnu-emacs@gnu.org; Sun, 07 Jun 2020 10:31:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:43043) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jhwKF-0004pr-Mb for bug-gnu-emacs@gnu.org; Sun, 07 Jun 2020 10:31:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jhwKD-0005hM-Jq for bug-gnu-emacs@gnu.org; Sun, 07 Jun 2020 10:31:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 07 Jun 2020 14:31:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 41544 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 41544-submit@debbugs.gnu.org id=B41544.159154021921853 (code B ref 41544); Sun, 07 Jun 2020 14:31:01 +0000 Original-Received: (at 41544) by debbugs.gnu.org; 7 Jun 2020 14:30:19 +0000 Original-Received: from localhost ([127.0.0.1]:54588 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jhwJX-0005gP-DG for submit@debbugs.gnu.org; Sun, 07 Jun 2020 10:30:19 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:52800) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jhwJV-0005gA-Pz for 41544@debbugs.gnu.org; Sun, 07 Jun 2020 10:30:18 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:52335) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jhwJQ-0004Ze-H3; Sun, 07 Jun 2020 10:30:12 -0400 Original-Received: from [176.228.60.248] (port=3624 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jhwJM-0003wP-GT; Sun, 07 Jun 2020 10:30:11 -0400 In-Reply-To: <5AEB442C-5592-46E4-BC38-185BA9D2D956@acm.org> (message from Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= on Sun, 7 Jun 2020 11:13:01 +0200) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:181668 Archived-At: > From: Mattias Engdegård > Date: Sun, 7 Jun 2020 11:13:01 +0200 > Cc: Eli Zaretskii , 41544@debbugs.gnu.org > > The predicate should work with the argument both as a foreground and as a background colour, for selecting a black or white contrasting colour. The assumption is that the same predicate can be used for both, which may be wrong, but absent evidence to the contrary, I think it is a reasonable one to make. IME, it is unreasonable to assume that a pair of colors will be perceived as "contrasting enough" no matter which of them is foreground and which background. Background colors affect larger portions of display, and therefore a bright background is perceived as brighter and a dark background as darker, than when the same color is used as foreground.