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Date Posted: 06:31:05 04/23/03 Wed
Author: glup
Subject: Re: Enumerate TIFF Tags in a File
In reply to: Michel 's message, "Re: Enumerate TIFF Tags in a File" on 21:10:27 04/20/03 Sun

>Hi Glup,
>I have not tried this. See the calls to TIFFGetField
>in EnTifGr.Pas.

Yes I have seen that.

>I think the difficulty is that it is is not known what
>type of data is in the tag (ie, PChar, Integer, ...)

The type of an entry in the IFD is part of the IFD entry.
Problematic is for 'unoffical' Tags to understand the meaning of tag values. There is e.g. no type for "file offset". But understanding the meaning of Tags is something fully different than enumerating them.

>TIFFGetField will return True if a tag exists.

I have seen this. But this works only for the limited number of tags supported by libtiff. I'm not interested in the value, just which Tags are in the IFD.

If I would have information regarding the version of libtiff used by Envision I would possibly be able to do it on my own.



>>I'm looking for the method to enumerate the TIFF Tags
>>contained in a TIFF file.
>>Is the only supported way to do trail and error with
>>all possible values from 0 to $FFFFFFFF (I know that
>>values above $0000FFFF) are private tags)?

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