André Mantz <[EMAIL PROTECTED]> writes: > Hello, > > sorry about my bad english, I hope you understand me.
No problem, I'm not a native speaker either, and I think your English is fine! > I tried to add tags for the gps-coordinates to a jpeg-file with existing > Exif-data. > This is, what I do (e.g. LAT 52° 30’ 45.0’’ and LON 9° 15’ 30.0’’): > > $jpeg = new PelJpeg($filename); > $tiff = $exif->getTiff(); > $ifd0 = $tiff->getIfd(); > $desc1 = new PelEntryRational(PelTag::GPS_LATITUDE, array(52,1), > array(30,1), array(45,1)); > $ifd0->addEntry($desc1); > $desc2 = new PelEntryRational(PelTag::GPS_LONGITUDE, array(9,1), > array(15,1), array(30,1)); > $ifd0->addEntry($desc2); > $desc3 = new PelEntryAscii(PelTag::IMAGE_DESCRIPTION, 'only for test'); > $ifd0->addEntry($desc3); > file_put_contents($new_filename, $jpeg->getBytes()); > > After processing the script (with no errors), there a no gps-tags in > the file. If read the exif with: > > $jpeg = new PelJpeg($filename); > $tiff = $exif->getTiff(); > $ifd0 = $tiff->getIfd(); > $lat = $ifd0->getEntry(PelTag::GPS_LATITUDE); > $lon = $ifd0->getEntry(PelTag::GPS_LONGITUDE); > $test = $ifd0->getEntry(PelTag:: IMAGE_DESCRIPTION); > > The result is: $lat and $lon both are null, but $test is filled correctly. > > What is my fault? It is not so much your fault but PEL's... you are adding the entries to IFD0, but GPS related tags must be added to a GPS sub-IFD of the IFD0 -- not my idea... but that's the Exif standard :-) This post has the solution: http://article.gmane.org/gmane.comp.web.pel.devel/58 namely code like this: $gps = new PelIfd(PelIfd::GPS); $ifd0->addSubIfd($gps); $lat = new PelEntryRational(PelTag::GPS_LATITUDE, array(11,1),array(22,1),array(33,1)); $gps->addEntry($lat); It is of course a bug that PEL accepts the latitude and longitude tags in IFD0. I have just committed a fix for this as revision 510. I have only changed PelIfd.php and you can get a copy of it here: http://pel.svn.sourceforge.net/viewvc/pel/trunk/PelIfd.php Could you please check that it correctly catches your mistake. It should throw an exception when you try to add the GPS tags in IFD0. -- Martin Geisler VIFF (Virtual Ideal Functionality Framework) brings easy and efficient SMPC (Secure Multi-Party Computation) to Python. See: http://viff.dk/.
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