Return-Path: <tiff-admin@remotesensing.org>
Received: from inmx012.isp.belgacom.be (inmx012.isp.belgacom.be [195.238.3.90])
        by mailst006.isp.belgacom.be (8.12.9/8.12.9/Skynet-MAILSTORE-2.14) with ESMTP id i4AMV9Bt004224
        for <joris.at.lebbeke@skynet.be>; Tue, 11 May 2004 00:31:09 +0200
        (envelope-from <tiff-admin@remotesensing.org>)
Received: from yoda.imagelinks.com ([208.24.120.44])
        by inmx012.isp.belgacom.be (8.12.9/8.12.9/Skynet-IN-2.32) with ESMTP id i4AMV3Pp007798
        for <joris.at.lebbeke@skynet.be>; Tue, 11 May 2004 00:31:04 +0200
        (envelope-from <tiff-admin@remotesensing.org>)
Received: from yoda.imagelinks.com (localhost.localdomain [127.0.0.1])
	by yoda.imagelinks.com (8.11.6/8.11.6) with ESMTP id i4AMUBn23278;
	Mon, 10 May 2004 18:30:11 -0400
Received: from fuzzylog.simplesystems.org (fuzzylog.simplesystems.org [65.66.246.65])
	by yoda.imagelinks.com (8.11.6/8.11.6) with ESMTP id i4AMTYn23230
	for <tiff@remotesensing.org>; Mon, 10 May 2004 18:29:35 -0400
Received: from scooby.simplesystems.org (scooby.simplesystems.org [65.66.246.67])
	by fuzzylog.simplesystems.org (8.9.3/8.9.3) with ESMTP id RAA04387;
	Mon, 10 May 2004 17:29:13 -0500 (CDT)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
X-X-Sender: bfriesen@scooby.simplesystems.org
To: James Carroll <jim@microbrightfield.com>
cc: tiff@remotesensing.org
Subject: Re: [Tiff] Tiff questions
In-Reply-To: <5EA4B2EDD4BA8B4C84BE11298F81ADC4037715@exchange.microbrightfield.com>
Message-ID: <Pine.GSO.4.44.0405101722320.21890-100000@scooby.simplesystems.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: tiff-admin@remotesensing.org
Errors-To: tiff-admin@remotesensing.org
X-BeenThere: tiff@remotesensing.org
X-Mailman-Version: 2.0.13
Precedence: bulk
List-Help: <mailto:tiff-request@remotesensing.org?subject=help>
List-Post: <mailto:tiff@remotesensing.org>
List-Subscribe: <http://remotesensing.org/mailman/listinfo/tiff>,
	<mailto:tiff-request@remotesensing.org?subject=subscribe>
List-Id: TIFF and libtiff discussion <tiff.remotesensing.org>
List-Unsubscribe: <http://remotesensing.org/mailman/listinfo/tiff>,
	<mailto:tiff-request@remotesensing.org?subject=unsubscribe>
List-Archive: <http://remotesensing.org/pipermail/tiff/>
Date: Mon, 10 May 2004 17:29:13 -0500 (CDT)
X-UIDL: b2ccc214190554a80622089c2f73ef6e

On Fri, 7 May 2004, James Carroll wrote:

> Hi,  I have a bunch of questions.
>
> I am exploring using TIFF support for my image server that also supports
> FlashPIX.  The general idea is that the images are very large, and
> people want to zoom in and out, so I am trying (pyramidal) multiple
> levels of downsampled versions of the same image, all stored as
> jpeg-compressed tiles.

You might consider using the "Pyramid" TIFF scheme supported by
ImageMagick/GraphicsMagick ("PTIF" format).  This scheme is a bit
FlashPIX-like.

The strategy is to store multiple resolutions (different scaled sizes)
of the image as frames of a multi-frame TIFF.  Each frame is stored in
tiled TIFF format.  This allows the resolution to be quickly selected,
and then a region may be efficiently extracted by reading the
associated TIFF tiles.

To prepare the image, ImageMagick/GraphicsMagick simply successively
reduces the image size and saves the result as a frame until the image
size reaches a minimum threshold.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen

_______________________________________________
Tiff mailing list
Tiff@remotesensing.org
http://remotesensing.org/mailman/listinfo/tiff
