From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14852 invoked by alias); 15 Aug 2011 18:26:11 -0000 Received: (qmail 14797 invoked by uid 22791); 15 Aug 2011 18:26:09 -0000 X-SWARE-Spam-Status: No, hits=-2.0 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,RCVD_IN_DNSWL_LOW X-Spam-Check-By: sourceware.org Received: from out4.smtp.messagingengine.com (HELO out4.smtp.messagingengine.com) (66.111.4.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 15 Aug 2011 18:25:46 +0000 Received: from compute3.internal (compute3.nyi.mail.srv.osa [10.202.2.43]) by gateway1.messagingengine.com (Postfix) with ESMTP id 836BE215EB for ; Mon, 15 Aug 2011 14:25:45 -0400 (EDT) Received: from frontend1.messagingengine.com ([10.202.2.160]) by compute3.internal (MEProxy); Mon, 15 Aug 2011 14:25:45 -0400 Received: from [158.147.67.90] (158-147-67-90.harris.com [158.147.67.90]) by mail.messagingengine.com (Postfix) with ESMTPSA id 3ACF141D372; Mon, 15 Aug 2011 14:25:45 -0400 (EDT) Message-ID: <4E4964A8.5000904@cwilson.fastmail.fm> Date: Mon, 15 Aug 2011 18:26:00 -0000 From: Charles Wilson Reply-To: Charles Wilson User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 To: Mailing List: CygWin-Apps Subject: Re: 256x256 px icons References: <4E4245B4.3020107@etr-usa.com> <20110810100725.GA6563@calimero.vinschen.de> <20110810102335.GD6563@calimero.vinschen.de> <4E428F62.4090001@etr-usa.com> <20110811103856.GC24478@calimero.vinschen.de> <4E44444A.2080700@etr-usa.com> <20110812065957.GH16226@calimero.vinschen.de> <20110812091232.GA7658@calimero.vinschen.de> <4E492E3B.8060607@etr-usa.com> <4E493EF1.9070408@cwilson.fastmail.fm> <20110815155953.GB29857@calimero.vinschen.de> In-Reply-To: <20110815155953.GB29857@calimero.vinschen.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-apps-help@cygwin.com; run by ezmlm Precedence: bulk Sender: cygwin-apps-owner@cygwin.com List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Mail-Followup-To: cygwin-apps@cygwin.com X-SW-Source: 2011-08/txt/msg00186.txt.bz2 On 8/15/2011 11:59 AM, Corinna Vinschen wrote: > Are you talking about recent gimp versions? I wasn't talking specifically about any GIMP version -- I was surmising based on what you guys described as GIMP's behavior. > In my gimp I have the > choice of four different interpolation algorithms, "None", This sounds like the dumb "pix every Nth pixel" algorithm. It probably devolves to > "Linear", ...this, when the downsampling factor is not an integer. ("linear" is implicitly "bi-linear" when you're dealing with a 2D image). > "Cubic", and "Sinc (Lanczos3)", whatever each of them means. I guess I > just don't want to know in such great detail... Sinc is the theoretically "correct" operation, but for obscure reasons can't *really* be implemented in real life, because a /true/ sinc function has infinite extent. So, they probably mean a "windowed sinc" function...which has other (mostly theoretical) problems (unless the "window" is not a simple "box" window, but is instead a hamming, hanning, or certain other "windows". But even then, you encounter certain OTHER arcane problems. In practice, I'm sure either cubic or sinc will be fine. Cubic is usually faster. In the end, what *looks good* is what matters here. -- Chuck