Changing the time on several dozen jpegs at once

[Dotan Cohen]

On 23/08/06, Dariusz J. Garbowski <thuforuk at yahoo.co.uk> wrote:
> On 08/22/2006 10:15 PM, Dotan Cohen wrote:
> > A friend had let my camera sit overnight with no batteries, and when
> > he finally relaced them he set the clock to AM time instead of PM
> > time. How can I add 12 hours exactly to all the photos in a certain
> > directory? I would prefer a solution that would not lose jpeg image
> > quality, as I know that rewriting a jpeg reduces quality in most
> > cases. The windows program JpegHammer does this, but I'd rather not go
> > hunting for a windows computer ever time I get stuck. Even a cli
> > command (or script) would be most helpful. Thanks in advance.
>
> You can use commandline jhead for this, no change to your images other
> than Exif timestamp will be done.
>
> Another, more complex, yet much more powerful (if not the most powerful
> of all in metadata manipulation software class), program is Phil
> Harvey's ExifTool http://www.sno.phy.queensu.ca/~phil/exiftool/
>
> Regards,
> Dariusz
>

Thanks, Dariusz. I'll look into both these options, though I do prefer
the command line option.

Dotan Cohen
http://lyricslist.com