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Date Posted: 19:21:47 04/26/03 Sat
Author: Michel
Subject: Re: Enumerate TIFF Tags in a File
In reply to: glup 's message, "Re: Enumerate TIFF Tags in a File" on 06:31:05 04/23/03 Wed


Hi Glup,

The verson of libtiff used is "Version 3.4beta037".

You will be able see which functions are availabe by looking at the t*.h in the csource directory. As mentionned in my other post, the calls to routines in the .obj files are made from EnCLib.Pas.

Best regards,

Michel

>>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.
>
>Rgds
>
>:-glup
>
>
>>>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)?
>>>
>>>Rgds
>>>
>>>:-glup

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