The pictures on my wife's camera phone (Exif data) is +4 hours.
The file modification time is according to when it was uploaded from her phone to a web server.
Uploading to a web server modifies the file names.
The file names are changed from the cell phone manufacturer's naming scheme to a differing phone service provider naming scheme, and they are not even sequential.
What a mess.
I spent 15 minutes on the phone with my cell phone provider.
The tech guy asked, "Is that a problem?"
I replied, "Only when you want to record what happened when".
I was put on hold, and then disconnected a couple minutes later.
exiv2 to the rescue...
Step #1 substract 4 hours from create time
exiv2 -a -04 ad *.jpg
Step #2 sync creation time to file modification date and file name
exiv2 -T rename *.jpg
Exif creation date is now correct.
Pictures are renamed in more meaningful "YearMonthDay_HourMinuteSecond.jpg" format.
Subsequent color/brightness/etc adjustments, only effect the file time stamp.
/robin
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