Jeff Abrahamson on 12 Jan 2006 03:03:06 -0000


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[PLUG] jpeg, 1322 bytes, and iPhoto 

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?

    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 â 304 Ä
    IMG_1051.JPG other-IMG_1051.JPG differ: byte 5, line 1 is 107 G  73 ;
    IMG_1052.JPG other-IMG_1052.JPG differ: byte 18425, line 74 is 342 â 304 Ä
    IMG_1053.JPG other-IMG_1053.JPG differ: byte 18428, line 77 is 342 â 304 Ä
    IMG_1054.JPG other-IMG_1054.JPG differ: byte 18960, line 83 is 342 â 304 Ä
    IMG_1055.JPG other-IMG_1055.JPG differ: byte 17537, line 78 is 342 â 304 Ä
    IMG_1056.JPG other-IMG_1056.JPG differ: byte 17251, line 66 is 342 â 304 Ä
    IMG_1057.JPG other-IMG_1057.JPG differ: byte 17475, line 77 is 342 â 304 Ä
    IMG_1058.JPG other-IMG_1058.JPG differ: byte 17884, line 68 is 342 â 304 Ä
    IMG_1059.JPG other-IMG_1059.JPG differ: byte 17555, line 74 is 342 â 304 Ä
    IMG_1060.JPG other-IMG_1060.JPG differ: byte 16035, line 73 is 342 â 304 Ä
    IMG_1061.JPG other-IMG_1061.JPG differ: byte 16700, line 67 is 342 â 304 Ä
    IMG_1062.JPG other-IMG_1062.JPG differ: byte 16206, line 67 is 342 â 304 Ä
    IMG_1063.JPG other-IMG_1063.JPG differ: byte 16251, line 68 is 342 â 304 Ä
    IMG_1064.JPG other-IMG_1064.JPG differ: byte 16684, line 74 is 342 â 304 Ä
    IMG_1065.JPG other-IMG_1065.JPG differ: byte 16475, line 60 is 342 â 304 Ä
    IMG_1066.JPG other-IMG_1066.JPG differ: byte 15623, line 67 is 342 â 304 Ä
    IMG_1067.JPG other-IMG_1067.JPG differ: byte 15901, line 66 is 342 â 304 Ä
    IMG_1068.JPG other-IMG_1068.JPG differ: byte 15876, line 70 is 342 â 304 Ä
    IMG_1069.JPG other-IMG_1069.JPG differ: byte 15877, line 73 is 342 â 304 Ä
    IMG_1070.JPG other-IMG_1070.JPG differ: byte 15758, line 70 is 342 â 304 Ä
    IMG_1071.JPG other-IMG_1071.JPG differ: byte 15765, line 69 is 342 â 304 Ä
    IMG_1072.JPG other-IMG_1072.JPG differ: byte 15770, line 66 is 342 â 304 Ä
    IMG_1073.JPG other-IMG_1073.JPG differ: byte 15772, line 62 is 342 â 304 Ä
    IMG_1074.JPG other-IMG_1074.JPG differ: byte 15743, line 67 is 342 â 304 Ä
    IMG_1075.JPG other-IMG_1075.JPG differ: byte 15805, line 64 is 342 â 304 Ä
    IMG_1076.JPG other-IMG_1076.JPG differ: byte 15808, line 65 is 342 â 304 Ä
    IMG_1077.JPG other-IMG_1077.JPG differ: byte 15797, line 60 is 342 â 304 Ä
    IMG_1078.JPG other-IMG_1078.JPG differ: byte 15820, line 69 is 342 â 304 Ä
    IMG_1079.JPG other-IMG_1079.JPG differ: byte 15886, line 68 is 342 â 304 Ä
    IMG_1080.JPG other-IMG_1080.JPG differ: byte 15935, line 69 is 342 â 304 Ä
    IMG_1081.JPG other-IMG_1081.JPG differ: byte 15873, line 63 is 342 â 304 Ä
    IMG_1082.JPG other-IMG_1082.JPG differ: byte 15834, line 62 is 342 â 304 Ä
    IMG_1083.JPG other-IMG_1083.JPG differ: byte 16660, line 64 is 342 â 304 Ä
    IMG_1084.JPG other-IMG_1084.JPG differ: byte 16648, line 62 is 342 â 304 Ä
    IMG_1085.JPG other-IMG_1085.JPG differ: byte 16689, line 72 is 342 â 304 Ä
    IMG_1086.JPG other-IMG_1086.JPG differ: byte 16055, line 62 is 342 â 304 Ä
    IMG_1087.JPG other-IMG_1087.JPG differ: byte 16545, line 71 is 342 â 304 Ä
    IMG_1088.JPG other-IMG_1088.JPG differ: byte 16124, line 76 is 342 â 304 Ä
    IMG_1089.JPG other-IMG_1089.JPG differ: byte 16402, line 67 is 342 â 304 Ä
    IMG_1090.JPG other-IMG_1090.JPG differ: byte 16861, line 63 is 342 â 304 Ä
    IMG_1091.JPG other-IMG_1091.JPG differ: byte 17231, line 65 is 342 â 304 Ä
    IMG_1092.JPG other-IMG_1092.JPG differ: byte 16544, line 73 is 342 â 304 Ä
    IMG_1093.JPG other-IMG_1093.JPG differ: byte 16630, line 68 is 342 â 304 Ä
    IMG_1094.JPG other-IMG_1094.JPG differ: byte 16559, line 68 is 342 â 304 Ä
    IMG_1095.JPG other-IMG_1095.JPG differ: byte 17544, line 75 is 342 â 304 Ä
    jeff@astra:three-hours-dups $ 

-- 
 Jeff

 Jeff Abrahamson  <http://www.purple.com/jeff/>    +1 215/837-2287
 GPG fingerprint: 1A1A BA95 D082 A558 A276  63C6 16BF 8C4C 0D1D AE4B

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