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December 2004
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2004.12.13 15:16 "Re: TIFF Pyramid", by Eric Vergnaud
le 13/12/04 16:07, Grissom, Ed à ed.grissom@intergraph.com a écrit : > > > 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. > > > 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. > > > (*) Actually, the spec says one way, but an update says "here is a new way > 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 -------------------------------