====== Storing Photos after a Vacation ======

The problem: you return home from a vacation and took a lot of pictures. But not with a single camera. But you now want all images in one place, in chronological order. Here is what to do.

===== Download the images =====

  - Get the images from the cameras using PTP or MassStorage copying. Store the photos into separate directories (''sony'' and ''canon'')

===== Merge Chronological =====

  - photograph the clock of the more precise camera (Sony) with the other camera (Canon)
  - Use exiftool to read the EXIF date of that picture and compare it with the photographed time
  - Adjust the time of the photos (Canon) to match the clock of the more precise clock (Sony): <code>
# substract 5 minutes and 2 seconds from all dates:
exiftool -AllDates-='0:0:0 0:05:02' -overwrite_original canon/*.JPG
</code>
  - Move Canon Panorama Images to a sepearate dir <code>
mkdir pano
mv canon/ST* pano/
</code>
  - Create an output directory ''out''
  - Rename all files to their creation date and move them to the out directory <code>
exiftool '-FileName<DateTimeOriginal' -d out/%Y%m%d-%H%M%S-canon%%-c.%%e canon/*.JPG
exiftool '-FileName<DateTimeOriginal' -d out/%Y%m%d-%H%M%S-sony%%-c.%%e sony/*.JPG
</code>

===== GeoTag =====

  - Get the Tracklog from the GPS's card and convert NMEA to GPX: <code>
nmea2gpx.pl gpx/*.TXT
</code>
  - Take a photo of the GPS clock with the default date camera (sony)
  - Use exiftool to read the EXIF date of that picture and compare it with the photographed time
  - Geotag the photos, optionally also set some clear text location tags: <code>
# Camera is 2 hours and 2 seconds ahead of GPS's GMT
for GPX in gpx/*.gpx
do
  gpsPhoto.pl --dir out --gpsfile $GPX --city 'Rome' --country 'Italy' --timeoffset 7202
done
</code>