From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#41544: 26.3; Possible incorrect results from color-distance Date: Tue, 9 Jun 2020 14:19:29 +0200 Message-ID: <0BCBDA86-6586-4C73-8E58-DFDE8762C250@acm.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> <83zh9f6j9v.fsf@gnu.org> Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.14\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="112745"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 41544@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jun 09 14:20:10 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 1jidEg-000TE2-D0 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 09 Jun 2020 14:20:10 +0200 Original-Received: from localhost ([::1]:51610 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jidEf-0001VW-8H for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 09 Jun 2020 08:20:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:41172) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jidEY-0001VK-08 for bug-gnu-emacs@gnu.org; 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Tue, 09 Jun 2020 08:19:41 -0400 Original-Received: from mail1451c50.megamailservers.eu ([91.136.14.51]:32886 helo=mail266c50.megamailservers.eu) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jidEB-00075A-Gy for 41544@debbugs.gnu.org; Tue, 09 Jun 2020 08:19:40 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1591705172; bh=mLlu2TmNjOz9T0i9gWaiWzCAy2iuL49lCnXMEnj2Slk=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=VD6UEujI0aThoN8wuXl81GapxHXvUhBieqIGRbUe0OqEa0w9Uba0LX6oscWMkaI4O t02eNjrgDAMAWosgwdALVOwEzJGBwmpQiabDX3hsDnz8ihlf1bt/iiPXevgk+2DHjp cLFBxE0IJ+wLH8NvsLK4/svuQl2l1Ha6590wQbEE= Feedback-ID: mattiase@acm.or Original-Received: from stanniol.lan (c-4e4ae655.032-75-73746f71.bbcust.telenor.se [85.230.74.78]) (authenticated bits=0) by mail266c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 059CJTvw018661; Tue, 9 Jun 2020 12:19:31 +0000 In-Reply-To: <83zh9f6j9v.fsf@gnu.org> X-Mailer: Apple Mail (2.3445.104.14) X-CTCH-RefID: str=0001.0A782F19.5EDF7E54.0042:SCFSTAT68638221, ss=1, re=-4.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 X-CTCH-VOD: Unknown X-CTCH-Spam: Unknown X-CTCH-Score: -4.000 X-CTCH-Flags: 0 X-CTCH-ScoreCust: 0.000 X-CSC: 0 X-CHA: v=2.3 cv=A5MSwJeG c=1 sm=1 tr=0 a=klNLuyVZdLUgl+K5Uafb2A==:117 a=klNLuyVZdLUgl+K5Uafb2A==:17 a=kj9zAlcOel0A:10 a=M51BFTxLslgA:10 a=mDV3o1hIAAAA:8 a=TlfYVcsWVqIc_Eqo5lQA:9 a=CjuIK1q_8ugA:10 a=_FVE-zBwftR9WsbkzFJk:22 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:181770 Archived-At: 7 juni 2020 kl. 16.30 skrev Eli Zaretskii : > 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. Yes, but we should ask what that means in terms of a predicate to select = between them. Of all comparisons I've done, the latest color-dark-p = predicate appears to work fairly well for selecting backgrounds, in the = senses that it's never bad. You are quite right that the optimal predicate may be different, and I'm = not at all opposed to having two separate functions. They may be = identical initially, but could diverge as we learn more. Experimentally, it looks like the case of selecting a black/white = background is more forgiving: the set of 'ambiguous' colours that = contrast well with both black and white greater than when selecting a = black/white text. If you could come up with a colour that strongly prefers a black = background but a white foreground, or vice versa, then that would = provide us with more insight. If not, it might indicate that those = colours are rare.