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?
I edited the copy of the test photo and pressed ^S to save it after a
minor edit and reran the experiment. This time Shotwell did delete the
camera information and set the exif date to today. It appears that
using "save as" preserves this data and save does not. More testing
needed. The diff follows:
1,2d0
< Exif.Image.Make Ascii 10 Panasonic
< Exif.Image.Model Ascii 8 DMC-LZ7
4,7c2
< Exif.Image.XResolution Rational 1 72
< Exif.Image.YResolution Rational 1 72
< Exif.Image.ResolutionUnit Short 1 inch
< Exif.Image.Software Ascii 10 Ver.1.0
---
> Exif.Image.Software Ascii 15
Shotwell 0.9.3
9,15c4
< Exif.Image.YCbCrPositioning Short 1 Co-sited
< Exif.Image.ExifTag Long 1 418
< Exif.Photo.ExposureTime Rational 1 1/50 s
< Exif.Photo.FNumber Rational 1 F3.5
< Exif.Photo.ExposureProgram Short 1 Auto
< Exif.Photo.ISOSpeedRatings Short 1 100
< Exif.Photo.ExifVersion Undefined 4 2.21
---
> Exif.Image.ExifTag Long 1 98
18,92c7,15
< Exif.Photo.ComponentsConfiguration Undefined 4 YCbCr
< Exif.Photo.CompressedBitsPerPixel Rational 1 2
< Exif.Photo.ExposureBiasValue SRational 1 0 EV
< Exif.Photo.MaxApertureValue Rational 1 F2.8
< Exif.Photo.MeteringMode Short 1
Multi-segment
< Exif.Photo.LightSource Short 1 Unknown
< Exif.Photo.Flash Short 1 No,
compulsory
< Exif.Photo.FocalLength Rational 1 16.1 mm
< Exif.Photo.MakerNote Undefined 6774
(Binary value suppressed)
< Exif.MakerNote.Offset Long 1 920
< Exif.MakerNote.ByteOrder Ascii 3 II
< Exif.Panasonic.Quality Short 1 Normal
< Exif.Panasonic.FirmwareVersion Undefined 4 0 1 0 6
< Exif.Panasonic.WhiteBalance Short 1 Auto
< Exif.Panasonic.FocusMode Short 1 Auto
< Exif.Panasonic.AFMode Byte 2 Spot
mode off or 3-area (high speed)
< Exif.Panasonic.ImageStabilization Short 1 On, Mode 2
< Exif.Panasonic.Macro Short 1 Off
< Exif.Panasonic.ShootingMode Short 1
Intelligent ISO
< Exif.Panasonic.Audio Short 1 No
< Exif.Panasonic.DataDump Undefined 6152
(Binary value suppressed)
< Exif.Panasonic.WhiteBalanceBias Short 1 0 EV
< Exif.Panasonic.FlashBias Short 1 0
< Exif.Panasonic.InternalSerialNumber Undefined 16 70 51
53 48 55 48 50 49 51 48 53 54 48 0 0 0
< Exif.Panasonic.ExifVersion Undefined 4 2.20
< Exif.Panasonic.ColorEffect Short 1 Off
< Exif.Panasonic.TimeSincePowerOn Long 1 21697
< Exif.Panasonic.BurstMode Short 1 Off
< Exif.Panasonic.SequenceNumber Long 1 0
< Exif.Panasonic.Contrast Short 1 Normal
< Exif.Panasonic.NoiseReduction Short 1 Standard
< Exif.Panasonic.SelfTimer Short 1 Off
< Exif.Panasonic.Rotation Short 1
Horizontal (normal)
< Exif.Panasonic.ColorMode Short 1 Natural
< Exif.Panasonic.BabyAge Ascii 20
9999:99:99 00:00:00
< Exif.Panasonic.OpticalZoomMode Short 1 Standard
< Exif.Panasonic.ConversionLens Short 1 Off
< Exif.Panasonic.TravelDay Short 1 65535
< Exif.Panasonic.WorldTimeLocation Short 1 Home
< Exif.Panasonic.ProgramISO Short 1 65535
< Exif.Panasonic.MakerNoteVersion Undefined 4 1.01
< Exif.Panasonic.SceneMode Short 1
Intelligent ISO
< Exif.Panasonic.WBRedLevel Short 1 1625
< Exif.Panasonic.WBGreenLevel Short 1 1054
< Exif.Panasonic.WBBlueLevel Short 1 1802
< Exif.Panasonic.BabyAge Ascii 20
9999:99:99 00:00:00
< Exif.Photo.FlashpixVersion Undefined 4 1.00
< Exif.Photo.ColorSpace Short 1 sRGB
< Exif.Photo.PixelXDimension Long 1 3072
< Exif.Photo.PixelYDimension Long 1 2304
< Exif.Photo.InteroperabilityTag Long 1 7702
< Exif.Iop.InteroperabilityIndex Ascii 4 R98
< Exif.Iop.InteroperabilityVersion Undefined 4 1.00
< Exif.Photo.SensingMethod Short 1
One-chip color area
< Exif.Photo.FileSource Undefined 1
Digital still camera
< Exif.Photo.SceneType Undefined 1
Directly photographed
< Exif.Photo.CustomRendered Short 1 Normal
process
< Exif.Photo.ExposureMode Short 1 Auto
< Exif.Photo.WhiteBalance Short 1 Auto
< Exif.Photo.DigitalZoomRatio Rational 1 0.0
< Exif.Photo.FocalLengthIn35mmFilm Short 1 98.0 mm
< Exif.Photo.SceneCaptureType Short 1 Standard
< Exif.Photo.GainControl Short 1 None
< Exif.Photo.Contrast Short 1 Normal
< Exif.Photo.Saturation Short 1 Low
< Exif.Photo.Sharpness Short 1 Soft
< Exif.Image.PrintImageMatching Undefined 208
(Binary value suppressed)
< 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 3779
< Exif.Thumbnail.YCbCrPositioning Short 1 Co-sited
---
> Exif.Photo.PixelXDimension SLong 1 3018
> Exif.Photo.PixelYDimension SLong 1 2158
> Xmp.exif.PixelXDimension XmpText 4 3018
> Xmp.exif.PixelYDimension XmpText 4 2158
> Xmp.exif.DateTimeOriginal XmpText 20
2011:09:23 23:15:09
> Xmp.exif.DateTimeDigitized XmpText 20
2011-09-23T23:15:09Z
> Xmp.tiff.ImageWidth XmpText 1 1
> Xmp.tiff.ImageHeight XmpText 4 2158
> Xmp.xmp.CreateDate XmpText 20
2011-09-23T23:15:09Z
--
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