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Rotating JPEGs *without* changing modified date

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tomos:
here are two more tools that will be useful in this task.

• http://www.sentex.net/~mwandel/jhead/
• http://jpgtime.learsy.com/
-lanux128 (January 19, 2008, 12:30 PM)
--- End quote ---
that Learsy one is a thing of beauty :Thmbsup:



# no install
# simple to use -

* select files (all if you want) / click Set time from EXIF - it show the Exif time in the "New Time" column
* compare
* select those you want to change
* click Apply changes
then go off and donate to the author (donationware :up:)
http://www.muralpix.com/donation.html

tomos:
strange, now I'm finding whole folders where the EXIF/shooting time and modified times are an hour out -
obviously to do with the clock change... but -
hmm,
I think it's a bug but havent pinned it down yet - when I change just the files that were rotated and then recheck to compare times - the other files (who's dates I didnt change) no longer have the hour difference :tellme:

just done it again! will email the author

[edit] no idea what that was, it was the case with two different cameras, but only in pictures (roughly) taken the second half of 2007 - some unusual alignment of the planets or something... :-\ [/edit]

lanux128:
sounds like a bug alright but since i haven't tried it yet i can't be definitive.. so i'm going to download the app & see if the same happens to me.. in any case, go ahead & notify the author. :)

Cynic:
I've also noticed strange behaviour regarding EXIF shooting/modified times in my pics, but I believe it's a Windows problem (or feature?).

I may be completely wrong, but it appears that, let's say, I take a pic in December at 12:00:00 and store in my computer, the EXIF and Windows modified dates will be the same; however, once DST starts in March, it seems Windows changes the dates of all files, so the pic I took in December will still retain its EXIF shooting time, but the modified date will now be 13:00:00. Once the hour changes again, it will revert to the original 12:00:00.

tomos:
strange...

as I said it happened for me on a series of folders* (2nd half 2007) but not on photos taken the previous winter (2006/2007) so there didnt seem to be any logic to it...

* with TWO different cameras so I dont think I can blame the cameras... anyways I just ignored one hour differences which worked out well enough (although could also potentially cause confusion in certain situations, but I wasnt that worried about it :))

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