From owner-freebsd-questions@FreeBSD.ORG Mon Sep 7 12:51:28 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A48A4106568D for ; Mon, 7 Sep 2009 12:51:28 +0000 (UTC) (envelope-from mel.flynn+fbsd.questions@mailing.thruhere.net) Received: from mailhub.rachie.is-a-geek.net (rachie.is-a-geek.net [66.230.99.27]) by mx1.freebsd.org (Postfix) with ESMTP id 615B78FC0A for ; Mon, 7 Sep 2009 12:51:27 +0000 (UTC) Received: from smoochies.rachie.is-a-geek.net (mailhub.lan.rachie.is-a-geek.net [192.168.2.11]) by mailhub.rachie.is-a-geek.net (Postfix) with ESMTP id 2BFDF7E853; Mon, 7 Sep 2009 04:51:39 -0800 (AKDT) From: Mel Flynn To: freebsd-questions@freebsd.org Date: Mon, 7 Sep 2009 14:51:23 +0200 User-Agent: KMail/1.11.4 (FreeBSD/8.0-BETA3; KDE/4.2.4; i386; ; ) References: <20090906012107.E2731B7DD@kev.msw.wpafb.af.mil> <4AA47981.1090103@prgmr.com> In-Reply-To: <4AA47981.1090103@prgmr.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200909071451.24123.mel.flynn+fbsd.questions@mailing.thruhere.net> Cc: Michael David Crawford Subject: Re: Is there such thing as a 'soft checksum' tool? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Sep 2009 12:51:28 -0000 On Monday 07 September 2009 05:09:53 Michael David Crawford wrote: > > M> I'm looking for a pseudo-checksum tool for use with cataloging images. > > I've seen such tools advertised, but they were proprietary products and > only worked on windows. > > One way you could approach it might be to use a blur filter to blur each > of your images, and then to compare the blurred images. Small > differences in individual pixels would be blurred away. Did you guys miss Charlie Kester's message? And the above does not work, because of compression anyway. Just because you think of an image as a bitmap, does not mean it's stored as such. -- Mel