From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tomas Hlavaty Newsgroups: gmane.emacs.devel Subject: RE: Emacs Survey: Toolbars Date: Fri, 25 Dec 2020 22:59:00 +0100 Message-ID: <87sg7twnrv.fsf@logand.com> References: <87o8iv3ac3.fsf@gnus.org> <877dpjp30g.fsf@ucl.ac.uk> <87zh2fnmwq.fsf@gnus.org> <87o8ivumn5.fsf@telefonica.net> <87v9d3nkxk.fsf@gnus.org> <87a6u4imxq.fsf@logand.com> <87v9cq43ns.fsf@logand.com> <87h7o9yd3m.fsf@logand.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32994"; mail-complaints-to="usenet@ciao.gmane.io" To: Emacs developers Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Dec 25 23:01:16 2020 Return-path: Envelope-to: ged-emacs-devel@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 1ksv9A-0008V6-6k for ged-emacs-devel@m.gmane-mx.org; Fri, 25 Dec 2020 23:01:16 +0100 Original-Received: from localhost ([::1]:42468 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ksv99-00050Y-6t for ged-emacs-devel@m.gmane-mx.org; Fri, 25 Dec 2020 17:01:15 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52664) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ksv73-00046n-39 for emacs-devel@gnu.org; Fri, 25 Dec 2020 16:59:05 -0500 Original-Received: from logand.com ([37.48.87.44]:37594) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ksv70-0005NY-Q6 for emacs-devel@gnu.org; Fri, 25 Dec 2020 16:59:04 -0500 Original-Received: by logand.com (Postfix, from userid 1001) id 22A5219F4C7; Fri, 25 Dec 2020 22:59:02 +0100 (CET) X-Mailer: emacs 26.3 (via feedmail 11-beta-1 I) In-Reply-To: Received-SPF: pass client-ip=37.48.87.44; envelope-from=tom@logand.com; helo=logand.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:261777 Archived-At: On Fri 25 Dec 2020 at 12:25, Drew Adams wrote: >> > > Do you have suggestion for automatically computing "it's not too hard" >> > > color mapping for "inverse video" "pure" text? >> > >> > Convert the color's YUV and invert the Y. >> >> Possibly better: keep the hue and saturation and recalculate luminance >> to preserve the relative contrast to background color. > > There are lots of ways to "invert" or complement a color. > > I just use RGB complementing - good enough for most > purposes for Emacs foregrounds and backgrounds. Function > `color-complement' in color.el does that. So does > `hexrgb-complement' in hexrgb.el. > > Or I use `hexrgb-hue-complement', > `hexrgb-saturation-complement', or `hexrgb-value-complement' > If I just want to complement one of those components. Brilliant, it's already in Emacs, thank you!