It seems that Kipi uses the convert tool from ImageMagick. I Installed the exif tool and tried to compress pictures by hand to see what happens with my exif data. Extracting the exif information from the original picture goes fine. After recompressing it the exif tool complains that the data is corrupt.
stephane@nausicaa:~$ exif IMG_0080.JPG > IMG_0080.exif stephane@nausicaa:~$ convert -quality 80 IMG_0080.JPG IMG_0080_2.JPG stephane@nausicaa:~$ exif IMG_0080_2.JPG > IMG_0080_2.exif Données corrompues Les données fournies ne respectent pas les spécifications. ExifLoader: Les données fournies ne semblent pas contenir de données EXIF. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1009230 Title: EXIF information is lost on "Recompress Images" batch processing To manage notifications about this bug go to: https://bugs.launchpad.net/kipi-plugins/+bug/1009230/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs