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Date Posted: 06:27:26 01/15/04 Thu
Author: Michel
Subject: Re: libtiff v3.6.x support; Custom Tags
In reply to: glup 's message, "Re: libtiff v3.6.x support; Custom Tags" on 06:05:33 01/13/04 Tue

Hi Glup,

Thanks. I have noted your input. Let me know your email, so I can contact you when I work on some of these changes.

Best regards,


>>Thanks for the info. It is definitely on the list.
>>Before spring I intend to release version 2.5, and
>>this could be in there.
>Sounds nice to me!
>3 major points for the wish-list regarding tiff:
>1. Collection of Tiff Tags
>Please include a list to read all existing tags,
>something like
>TTiffTag = class(CollectionItem)
> property Tag: word read ...;
> property Type: word read ...;
> property Length: longword read ...;
> property Value: variant read ... write ...;
> property IsRaw: boolean read ...;
>TTiffTags = class(Collection)
> property Count: integer read ...;
> property Item[ const aIndex: integer ]: TTiffTag
>read ...; default;
> function Add(const aTag: word;
> const aType: word;
> const aValue: variant): integer;
> procedure Delete( const aIndex: integer );
>TTiffGraphic = ....
> ...
> ...
> property TiffTags: TTiffTags read ... write ...;
> property TiffTagValue[ const aTag: word ]: variant
>read ... write ...;
>It would allow to easy iterate through the tags in the
>current directory, having access to all relevant tag
>data and easy access to Tag Values.
>2. fax2tiff
>In the libtiff package is a application fax2tiff
>included. It allows to translate raw fax data files to
>TIFF files. If this would be included as a function
>reading from a stream, I could provide a new class
>allowing read of Winfax fax files by inheriting from
>tiff (mainly using libtiff decompression
>implementation). For this case it would be nice to
>implement a "protected" TCustomTiffGraphic where
>TTiffGraphic and TWinfaxGraphic inherit from.
>3. Support for Sub-IFDs
>TIFF allows sub-IFDs, currently used for Thumbnails or
>jpeg previews (becomes valueable if you have a 400MB
>graphic...). It would be valuable to being able to
>access this Sub-IFDs for read as well as for write.
>And somthing more...
>Envision could read strip-encoded tiffs. I would like
>to read and write strip as well as tile encoded

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