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Date Posted: 17:57:42 02/13/02 Wed
Author: Michel
Subject: Re: TIFF SaveToStream
In reply to: glup 's message, "TIFF SaveToStream" on 09:15:36 02/13/02 Wed


Hi Glup,

Some tags do get changed, and I think this is normal. For example,

TIFFTAG_SOFTWARE
TIFFTAG_DATETIME

Some of the tags you list are not manipulated by Envision, but you could change them. See the code in

EnTifGr.WriteDibToTiffStream

I have also done work to expose common tags,

property DocumentNameTag : AnsiString read FDocumentNameTag write FDocumentNameTag;
property ImageDescriptionTag : AnsiString read FImageDescriptionTag write FImageDescriptionTag;
property ScannerMakeTag : AnsiString read FScannerMakeTag write FScannerMakeTag;
property ScannerModelTag : AnsiString read FScannerModelTag write FScannerModelTag;
property PageNameTag : AnsiString read FPageNameTag write FPageNameTag;
property SoftwareTag : AnsiString read FSoftwareTag write FSoftwareTag;
property DateTimeTag : AnsiString read FDateTimeTag write FDateTimeTag;
property ArtistTag : AnsiString read FArtistTag write FArtistTag;
property HostComputerTag : AnsiString read FHostComputerTag write FHostComputerTag;

as properties in TTiffGraphic. Let me know if you need these.

Best regards,

Michel
>I have just tried to load a TIFF and then save it
>again. It seams that this changes the file.
>
>Especially I found out that TIFF Tag Data is changed
>that does not contain the pure image data or data for
>interpretion of that, but for importance for automatic
>processing:
>
>TIFFTAG_DOCUMENTNAME
>TIFFTAG_IMAGEDESCRIPTION (contains in some Fax Systems
>the Sender Id)
>TIFFTAG_GROUP3OPTIONS
>TIFFTAG_FAXMODE
>TIFFTAG_MAKE
>TIFFTAG_MODEL
>TIFFTAG_SOFTWARE
>TIFFTAG_DATETIME
>TIFFTAG_FAXRECVPARAMS
>TIFFTAG_FAXSUBADDRESS
>TIFFTAG_FAXRECVTIME
>
>Why are they changed?
>Could I manipulate these Tags? If yes how?
>
>Rgds
>
>glup

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