LibTiff Mailing List

David E. Meier wrote:
>
> How can a fax header (number, time, name) - or any kind of text - be added
> at the top of an existing tiff image? Is this possible with libtiff? Or
> should such a task be done prior to tiff image generation?

libtiff is not in the business of editing images, it only provides access to
them. What you can do is read the image using libtiff, add a few lines
containing pixels representing your text to your image buffer, and use
libtiff to write out the result.

Depending on the kind of compression, it might be possible to do this
without decompressing and recompressing the image, but you'd need expert
knowledge on the compression method for that, and the time saved probably
isn't worth it.

Alternatively, instead of writing your own program, you can use a suite of
programs like netpbm or ImageMagick for this. These contain ready-made
programs for this kind of thing (you may have to chain a few of those
programs together).

					Gerben Vos.


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive March 2006 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2006.03.20 17:43 "Adding Header Line for Fax Images", by David E Meier 2006.03.22 16:58 "Re: Adding Header Line for Fax Images", by Gerben Vos 2006.03.23 17:15 "Re: Adding Header Line for Fax Images", by Ulf Zibis 2006.03.22 16:58 "Re: Adding Header Line for Fax Images", by Gerben Vos David E. Meier wrote: > > How can a fax header (number, time, name) - or any kind of text - be added > at the top of an existing tiff image? Is this possible with libtiff? Or > should such a task be done prior to tiff image generation? libtiff is not in the business of editing images, it only provides access to them. What you can do is read the image using libtiff, add a few lines containing pixels representing your text to your image buffer, and use libtiff to write out the result. Depending on the kind of compression, it might be possible to do this without decompressing and recompressing the image, but you'd need expert knowledge on the compression method for that, and the time saved probably isn't worth it. Alternatively, instead of writing your own program, you can use a suite of programs like netpbm or ImageMagick for this. These contain ready-made programs for this kind of thing (you may have to chain a few of those programs together). Gerben Vos.

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2006.03.22 16:58 "Re: Adding Header Line for Fax Images", by Gerben Vos