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Date Posted: 04:40:37 04/19/03 Sat
Author: glup
Subject: Re: TIFF Sub Images
In reply to: glup 's message, "TIFF Sub Images" on 19:21:54 04/18/03 Fri

>The TIFF format allows to assign to each Image in the
>main TIFF IFD with the tag TIFFTAG_SUBIFD = 330 a sub
>IFD, e.g. containing derivated images of the main
>image, where the type is indicated by
>TIFFTAG_SUBFILETYPE (e.g. FILETYPE_REDUCEDIMAGE for a
>thumbnail or FILETYPE_MASK for a mask).
>I have understood how to read TIFFTAG_SUBIFD to
>receive the subimage IFD file offset. The question is
>how to load images from that "sub directory" in the
>TIFF file.
>

I have just read, that the Envision TIFF support is based on libtiff. libtiff provides the function TIFFSetSubDirectory(tiff, offset). I have not found this in Envision.

Rgds

:-glup

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