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Re: [PLUG] jpeg, 1322 bytes, and iPhoto
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In the message dated: Wed, 11 Jan 2006 22:05:35 EST,
The pithy ruminations from Jeff Abrahamson on
<[PLUG] jpeg, 1322 bytes, and iPhoto> were:
=>
=>
=> I pulled some jpeg files from a compact flash card onto a Mac running
=> OS X. Some of the photos were touched by iPhoto magic or some similar
=> OS X sorcery. The result is that I have two copies of 46 photos, one
=> copy touched, the other not. The apparently untouched files are all
=> 1322 bytes longer.
=>
=> It's not of practical importance, as the images all look fine, but I'm
=> very curious what happened. Below is a diff. The outlier, 1051, was
=> rotated (by iPhoto?). On each image I've checked, the files are
=> visually identical. Indeed, using imagemagick to subtract one from
=> the other results in complete black (confirmed with gimp's histogram
=> tool).
=>
=> Any ideas what might have happened and what 1322 bytes might signify?
I'm guessing that the retouched photos lack the EXIF data embedded in the
original jpeg files. That data typically records information like the time,
date, shutter speed, white-balance curve, aperture setting, exposure number,
etc.
Mark
=>
=> jeff@astra:three-hours-dups $ for f in *; do cmp -b $f other-$f; done
=> IMG_1050.JPG other-IMG_1050.JPG differ: byte 17138, line 78 is 342 =E2 =
[SNIP!]
=> --=20
=> Jeff
=>
=> Jeff Abrahamson <http://www.purple.com/jeff/> +1 215/837-2287
=> GPG fingerprint: 1A1A BA95 D082 A558 A276 63C6 16BF 8C4C 0D1D AE4B
=>
=> --Kj7319i9nmIyA2yE
=> Content-Type: application/pgp-signature; name="signature.asc"
=> Content-Description: Digital signature
=> Content-Disposition: inline
=>
=> -----BEGIN PGP SIGNATURE-----
=> Version: GnuPG v1.4.2 (GNU/Linux)
=>
=> iD8DBQFDxcd/Fr+MTA0drksRAozYAJwOuiEmuAjf0jFtTd5JOFknooY4YgCfaHN0
=> vZSveS3RjAUDsOjtiUha6Us=
=> =VZZJ
=> -----END PGP SIGNATURE-----
----
Mark Bergman
Seeking a Unix or Linux sysadmin position local to Philadelphia or via telecommuting
http://wwwkeys.pgp.net:11371/pks/lookup?op=get&search=bergman%40merctech.com
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