Tnx Even I suspected that -strict was not "complete". In any case My first code version was adding tags over an already generated COG, but the result was an unreadable/broken file in QGIS. I suppose because pyexiv2 is not flexible enough and stuck with a rigid version of tiff structure. I'll try a workaround using some lib or app able to maintain a readable image, tnx for the hint.
Luigi Pirelli ************************************************************************************************** * LinkedIn: https://www.linkedin.com/in/luigipirelli * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli * GitHub: https://github.com/luipir * Book: Mastering QGIS3 - 3rd Edition <https://www.packtpub.com/eu/application-development/mastering-geospatial-development-qgis-3x-third-edition> ************************************************************************************************** On Thu, 14 Nov 2024 at 13:02, Even Rouault <even.roua...@spatialys.com> wrote: > Luigi, > > The GDAL GeoTIFF or COG drivers have currently no provision for writing > EXIF (the fact that you see Exif.Image.Software is due to, I assume, > exiftool synthetizing that information from the regular Software TIFF tag, > which is propagated), so I don't have any solution to offer. Could > potentially be implemented, but not a 5-minute job. > > "Breaking" the COG structure shouldn't be the end of the world. The > breakage should be minimal. That will just cause one extra HTTP GET to > clients. 95% of the value of COG is just being a tiled GeoTIFF with > overviews. Putting all metadata (including the main TIFF directory) at > beginning of the file is just the cherry on the cake. > > (a quick skim at https://github.com/airbusgeo/cogger which is useful to > COGify a tiled GeoTIFF doesn't show any provision for EXIF, so I don't > think you can use it for your use case) > > The XMP TIFF tag is propagated: > > $ gdal_translate autotest/gdrivers/data/gtiff/byte_with_xmp.tif out.tif > -of cog > > $ gdalinfo out.tif -mdd all | grep XMP > Metadata (xml:XMP): > <rdf:li>XMP</rdf:li> > > Even > Le 14/11/2024 à 12:39, Luigi Pirelli via gdal-dev a écrit : > > Hi, > > I'm struggling to generate a COG maintaining the original (or at least a > selected subset of) Exif and XMP tags (I ses that Iptc tags are not > propagated at all, but I'm not interested in them). > I used gda_translate via CLI or python and the best option seems -strict > that, theoretically should maintain all original tags. > > But some standard tags are propagated and others not! > e.g. > Exif.Image.Software yes > Exif.Photo.CameraOwnerName no > Exif.Image.Artist yes > Exif.Image.Copyright yes > Exif.Image.DateTimeOriginal no > Exif.Photo.DateTimeOriginal no > Exif.Image.Model no > Exif.Image.CameraSerialNumber no > etc > > It is a bug? a feature? if a bug in any case is there a way to override? > The reason to find a solution is that adding tags over a COG with > "standard" tools like exiftool, exiv2 etc destroy COG structure. So I need > to add or modify tags before converting to COG. > > any suggestion? > > Luigi Pirelli > mails: lui...@gmail.com > luigi.pire...@geobeyond.it > > > ************************************************************************************************** > * LinkedIn: https://www.linkedin.com/in/luigipirelli > * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli > * GitHub: https://github.com/luipir > * Book: Mastering QGIS3 - 3rd Edition > <https://www.packtpub.com/eu/application-development/mastering-geospatial-development-qgis-3x-third-edition> > > ************************************************************************************************** > > _______________________________________________ > gdal-dev mailing > listgdal-dev@lists.osgeo.orghttps://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- http://www.spatialys.com > My software is free, but my time generally not. > Butcher of all kinds of standards, open or closed formats. At the end, this > is just about bytes. > >
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