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May 2005
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2005.06.06 13:25 "Re: tifflib read/write question", by <stopp@quart-edv.de>
> > I want to write a IPTC Tag into an existing tiff file. Do I need to > > load the image first and then write a new image, or is there a way to > > read/write a tiff like this: open tiff, change tag, close tiff (-> > > write/excange tag). > > Yes, you can do it that way. But every time after tag update you will > need to rewrite the whole directory, so the size of your TIFF file will > be increased. > > The tiffset utility from the libtiff package does exactly what you > need, so you can take it as a sample code. Dear Andrey, as I see it is only possible to change the offset of a tag and write the changed directory with tiffset utility. But if this tag is not in a tiff this way is not the right one. It seems to be, that I have to get all informations of a tiff, change/embedd iptc-photoshop and write a new tiff. There is a good source code coming with tiff_3.7.1 named tiffcp what is doing what I need. I extended this source by adding iptc-photoshop embedding. If someone is interested in this source-code please write me a mail. Best regards Jerry