On 07/04/18 03:22 PM, Jean-Luc CECCOLI wrote: > wonder why you feel offended by my first question - attempted you really read > and understood it -.
"Offended"? I think you are attributing an emotion to me unjustly. > I am long from being able to undedrstand DT's code. > > I just meant to ask : where does DT read the data it displays. In the file "exif.cc'. You can read it at https://github.com/darktable-org/darktable/blob/master/src/common/exif.cc > Then, you start speaking of semantics and think I'm someone very stupid - > well, > I admit I sometimes can be inattentive and miss some details -. It is about English language semantics. "Original" has a very specific meaning. There is both "Date Time" and "DateTime(original) Alter the first and keep the second inviolate in case you ever need to restore it. And all in all, I STRONGLY suggest that you take the advice offered by both Patrick and Peter and use the original rime to rename the file. I do this immediately after uploading and organize my images primarily by year/month. I may have subcategories of 'project-name' under that. Oh the joy of Linux! I can symlink across if needs be! >> You might also google for EXIF SEMANTICS >> > This still doesn't answear the question : why would you want me to do the > opposite of what I want ? Because you are doing the OPPOSITE of what you say you want. > Why should I ignore the only tag that DT actually takes into account ? If you read the file that I refer to above you will see it says (@line 1350) <quote> // According to the Exif specs DateTime is to be set to the last modification time while // DateTimeOriginal is to be kept. // For us "keeping" it means to write out what we have in DB to support people adding a time offset in // the geotagging module. </quote> The "Original" time is always the time the image was taken. DT enforces that in the above code. But the simple "DateTime" *CAN* be altered, and is altered in the geotagging module. You may want to alter it as a result of GPS information. <quote src="https://www.darktable.org/2017/12/darktable-2-4-0rc1-released/";> Fix timezone selection for geotagging on Windows </quote> > > I know it is possible to specify an offset value from within DT, but this will > be lost as soon as the database is reset and/or the sidecar is erased. Yes. Well, it you must do that ... expect to loose a LOT more information as well when you delete the sidecar! > How will I remember, say, 6 months later, that some peculiar photos were shot > with wrong date / time value ? ?Excuse me? Why are they 'wrong' in the first place? I don't know about your flow, but I set the DateTime on my camera so that the value is 'correct'. perhaps your problem lies in your camera? But, as Patrick and Peter point out, and as I practice too, the file name tells me the datetime the photo was taken, and I organize based on that. I think you have workflow problems, not exif value problems. -- The best victory is when the opponent surrenders of its own accord before there are any actual hostilities...It is best to win without fighting. ―― Sun-tzu, The Art of War. Planning a Siege ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
