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Date: Mon, 13 Dec 2004 16:16:43 +0100
Subject: Re: [Tiff] TIFF Pyramid
From: Eric VERGNAUD <eric.vergnaud@jlynx.com>
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le 13/12/04 16:07, Grissom, Ed =E0 ed.grissom@intergraph.com a =E9crit=A0:

>=20
>> I'm speaking of the TIFF pyramid as provided by Adobe
>> Photoshop. Since Adobe
>> owns the tiff specs, I guess that's the only official scheme.
>=20
>=20
> Well, the spec defines two different ways(*).
> Photoshop used to write one way, now it writes another, but it reads both=
.
> The GIS imaging world still uses the old way pretty much exclusively. We
> rarely have multiple main images in a file.
>=20
>=20
> (*) Actually, the spec says one way, but an update says "here is a new wa=
y
> that is better if you have multiple main images in a file"

Ok, the format I'm thinking of is the following:
 - the main image has its IFD in the main directory
 - the first subsampled image of a main image has its IFD in the sub IFD of
its main IFD
 - other subsampled images are linked to the first sub IFD

By the way, what is "The GIS imaging world" ?

-------------------------------
Eric VERGNAUD - JLynx Software
Cutting-edge technologies and
services for software companies
web: http://www.jlynx.com
-------------------------------


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