From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: mituharu@math.s.chiba-u.ac.jp Newsgroups: gmane.emacs.devel Subject: Re: Scale transformation of images Date: Sun, 16 Jun 2019 17:10:29 +0900 Message-ID: <6f63a580ef9153558515b211a7ccf566.squirrel@weber.math.s.chiba-u.ac.jp> References: <8475F4F0-00E8-44A9-BD60-6D3894E86EB0@gnu.org> <0D0F17C4-E0E1-46B0-A838-12DB00C9984C@gnu.org> Mime-Version: 1.0 Content-Type: text/plain;charset=iso-2022-jp Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="250081"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: SquirrelMail/1.4.22-5.el6 Cc: mituharu@math.s.chiba-u.ac.jp, emacs-devel@gnu.org To: "Eli Zaretskii" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun Jun 16 10:10:40 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hcQFJ-0012q0-Hb for ged-emacs-devel@m.gmane.org; Sun, 16 Jun 2019 10:10:37 +0200 Original-Received: from localhost ([::1]:38048 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hcQFI-0002Vr-BV for ged-emacs-devel@m.gmane.org; Sun, 16 Jun 2019 04:10:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55774) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hcQFD-0002Ul-RZ for emacs-devel@gnu.org; Sun, 16 Jun 2019 04:10:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hcQFC-0007Mo-RN for emacs-devel@gnu.org; Sun, 16 Jun 2019 04:10:31 -0400 Original-Received: from mathmail.math.s.chiba-u.ac.jp ([133.82.132.2]:60022) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hcQFB-0007LR-8b; Sun, 16 Jun 2019 04:10:29 -0400 Original-Received: from weber.math.s.chiba-u.ac.jp (weber [192.168.32.4]) by mathmail.math.s.chiba-u.ac.jp (Postfix) with ESMTP id 64645F08DA; Sun, 16 Jun 2019 17:10:29 +0900 (JST) (envelope-from mituharu@math.s.chiba-u.ac.jp) Original-Received: from 125.207.245.202 (SquirrelMail authenticated user mituharu) by weber.math.s.chiba-u.ac.jp with HTTP; Sun, 16 Jun 2019 17:10:29 +0900 In-Reply-To: <0D0F17C4-E0E1-46B0-A838-12DB00C9984C@gnu.org> X-Priority: 3 (Normal) Importance: Normal X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 133.82.132.2 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:237717 Archived-At: > Thanks. So you are saying that in the equations presented by Richard i= n > https://lists.gnu.org/archive/html/emacs-devel/2019-06/msg00361.html th= e > matrix Fij is the inverse of the matrix computed in image_set_transform= , > is that right? The equations themselves are correct, but the source and destination spaces are implicit. I would say the directions of the conversions you and Richard are thinkin= g about are inverse each other. See also item 2 in my previous post: https://lists.gnu.org/archive/html/emacs-devel/2019-06/msg00405.html YAMAMOTO Mitsuharu mituharu@math.s.chiba-u.ac.jp