On 09/27/2011 04:49 PM, Jim Nelson wrote:
I took a photo, modified it in direct-edit mode, and saved it. I then
ran this command for each:
$ exiv2 -pa IMG_0001.JPG > orig.txt
$ exiv2 -pa IMG_0002_saved.JPG > saved.txt
Then I did a diff (using meld) of the files. I see no changes other
than a couple expected modifications.
What do you see when you do this experiment?
-- Jim
I finally got around to running your experiment and I saw just what you
expected me to see as follows.
$ diff orig.txt copy.txt
7c7
< Exif.Image.Software Ascii 10 Ver.1.0
---
> Exif.Image.Software Ascii 15
Shotwell 0.9.3
10c10
< Exif.Image.ExifTag Long 1 418
---
> Exif.Image.ExifTag Long 1 424
26c26
< Exif.MakerNote.Offset Long 1 908
---
> Exif.MakerNote.Offset Long 1 914
65,67c65,67
< Exif.Photo.PixelXDimension Long 1 848
< Exif.Photo.PixelYDimension Long 1 480
< Exif.Photo.InteroperabilityTag Long 1 7690
---
> Exif.Photo.PixelXDimension SLong 1 703
> Exif.Photo.PixelYDimension SLong 1 312
> Exif.Photo.InteroperabilityTag Long 1 7696
84,91c84,90
< Exif.Thumbnail.Compression Short 1 JPEG
(old-style)
< Exif.Thumbnail.Orientation Short 1 top, left
< Exif.Thumbnail.XResolution Rational 1 72
< Exif.Thumbnail.YResolution Rational 1 72
< Exif.Thumbnail.ResolutionUnit Short 1 inch
< Exif.Thumbnail.JPEGInterchangeFormat Long 1 8084
< Exif.Thumbnail.JPEGInterchangeFormatLength Long 1 4027
< Exif.Thumbnail.YCbCrPositioning Short 1 Co-sited
---
> Xmp.exif.PixelXDimension XmpText 3 703
> Xmp.exif.PixelYDimension XmpText 3 312
> Xmp.exif.DateTimeOriginal XmpText 20
2011:08:31 23:03:18
> Xmp.exif.DateTimeDigitized XmpText 20
2011-08-31T23:03:18Z
> Xmp.tiff.ImageWidth XmpText 1 1
> Xmp.tiff.ImageHeight XmpText 3 312
> Xmp.xmp.CreateDate XmpText 20
2011-08-31T23:03:18Z
I got no idea, now, how I came to think it was deleting camera and other
data, but I was sure it was. I am glad to have run this test. I have
more confidence in Shotwell, now, and it is faster and easier than
firing up GIMP for such simple edits.
Thanks for your help, Jim.
Alex
--
Ourwoods.org
Those who would give up essential liberty to purchase a little temporary
safety deserve neither liberty nor safety. - Benjamin Franklin (391)
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