On 06/04/18 03:45 PM, William Ferguson wrote:
> As a further test, I modified the image again and subtracted another hour from
> the time. I removed the image from darktable, then imported it again and it
> showed 03:29:14 PM. So, it works correctly on my system with Canon raws. I
> looked around and found a Nikon file on my system. I imported it and then
> changed the time by an hour, removed it, and reimported it. The time in
> darktable stayed the same and did not reflect the change. I dumped the Nikon
> file with exiftool and there is a field Date/Time Original which still has the
> original time. I dumped the Canon file and it has the Date/Time Original
> field
> but the value is modified to the time I specified. It appears that exiv2
> doesn't set the Date/Time Original field inside Nikon files correctly.
You might use 'exif -l' to find *all* the tags that involve data and time for
the various file formats.
My FUji, for example, has
0x0132 Date and Time * - - - -
0x9003 Date and Time (Original) - - * - -
0x9004 Date and Time (Digitised) - - * - -
My Canon
0x0132 Date and Time * - - - -
0x829a Exposure Time - - * - -
0x882a Time Zone Offset - - - - -
0x9003 Date and Time (Original) - - * - -
0x9004 Date and Time (Digitised)
My Sony
0x0132 Date and Time * * - - -
0x829a Exposure Time - - * - -
0x882a Time Zone Offset - - - - -
0x9003 Date and Time (Original) - - * - -
0x9004 Date and Time (Digitised) - - * - -
If I were you I'd leave the "Original" time alone and alter the simple "Date and
Time"
--
Men never do evil so completely and cheerfully as when they do it from religious
conviction.
--Blaise Pascal (Pensees, 1670)
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