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#1
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When does EXIF data get lost?
I suspect I'm being unduly optimistic in hoping this is a question
with a relatively simple answer! When I browse folders of old photos, I would often like to know the precise date and time they were taken. But the EXIF data is missing for many. Presumably EXIF info must have existed for *all* of them when I first downloaded the DSC000xxxx.jpg images from my Sony Cybershot DSC-1 to my PC, but editing has destroyed it? Does anyone have or know of an up to date list of all operations by specific graphic editing programs which result in such destruction of the EXIF data please, so that I can make a point of avoiding them? Am I right that although Operation X in Program A might preserve EXIF, Operation X in Program B, or Operation Y in Program A (etc) might destroy it? IOW, it's something of a mess? If so, I guess the safest bet is to keep a copy of those originals, or at least a compact list of some sort of their EXIF dates, for future reference if it's inadvertently lost? -- Terry, West Sussex, UK |
#2
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While I don't have a list (would like to see one though!), some
editors do lose the EXIF data while others preserve it. Then, there is the argument I have heard that if the image is modified, the EXIF is no longer valid so should be discarded -- my pref would be to see an editor that when you modify an image, leaves the original EXIF data, but adds a comment in the comment field "modified and the date". Some editors advertise they preserve the EXIF data others are silent. Get a utility like irfanview (free) http://www.irfanview.com and use it to see what the EXIF data is (good program for other stuff too). I guess the bottom line is, yes, it is a crap shoot and you need to test all of your software used in modifying images to see which ones trash the EXIF data for you. I also like to keep the originals -- disk space is cheap these days (and make backups, but that is another thread in this group !! ) mikey "Terry Pinnell" wrote in message ... I suspect I'm being unduly optimistic in hoping this is a question with a relatively simple answer! When I browse folders of old photos, I would often like to know the precise date and time they were taken. But the EXIF data is missing for many. Presumably EXIF info must have existed for *all* of them when I first downloaded the DSC000xxxx.jpg images from my Sony Cybershot DSC-1 to my PC, but editing has destroyed it? Does anyone have or know of an up to date list of all operations by specific graphic editing programs which result in such destruction of the EXIF data please, so that I can make a point of avoiding them? Am I right that although Operation X in Program A might preserve EXIF, Operation X in Program B, or Operation Y in Program A (etc) might destroy it? IOW, it's something of a mess? If so, I guess the safest bet is to keep a copy of those originals, or at least a compact list of some sort of their EXIF dates, for future reference if it's inadvertently lost? -- Terry, West Sussex, UK |
#3
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Older versions of Photoshop, ACDSee, and Paintshop Pro that were not
EXIF "aware" would not preserve the EXIF data when the image was saved after editing/converting/etc. The best way to test your various applications is to take an original image, rename it, then edit/change it, then save it. Open it again to see what hapens to the EXIF data, and document the results. I'd also recommend updating/replacing any application that trashes the EXIF data fields - in the long run you won't regret it. Huffy On Fri, 12 Nov 2004 12:25:57 +0000, Terry Pinnell wrote: Am I right that although Operation X in Program A might preserve EXIF, Operation X in Program B, or Operation Y in Program A (etc) might destroy it? IOW, it's something of a mess? If so, I guess the safest bet is to keep a copy of those originals, or at least a compact list of some sort of their EXIF dates, for future reference if it's inadvertently lost? |
#4
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Older versions of Photoshop, ACDSee, and Paintshop Pro that were not
EXIF "aware" would not preserve the EXIF data when the image was saved after editing/converting/etc. The best way to test your various applications is to take an original image, rename it, then edit/change it, then save it. Open it again to see what hapens to the EXIF data, and document the results. I'd also recommend updating/replacing any application that trashes the EXIF data fields - in the long run you won't regret it. Huffy On Fri, 12 Nov 2004 12:25:57 +0000, Terry Pinnell wrote: Am I right that although Operation X in Program A might preserve EXIF, Operation X in Program B, or Operation Y in Program A (etc) might destroy it? IOW, it's something of a mess? If so, I guess the safest bet is to keep a copy of those originals, or at least a compact list of some sort of their EXIF dates, for future reference if it's inadvertently lost? |
#5
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JHoffnagle writes:
I'd also recommend updating/replacing any application that trashes the EXIF data fields - in the long run you won't regret it. I think Huffy is right on with that comment. However, if you have some application that you can't update or still trashes EXIF information, another step you can take is to rename the files with the date/time they were taken. This can be done in a batch with the free jhead program. You can also rotate according to your orientation sensor with jhead if you've also installed jpegtran. Download an example of jhead/jpegtran usage from he http://img.ourdoings.com/windows.html (I got the impression you were on Windows. If you're on Linux there's a link from there to the Linux version.) After you download it, look at the short do.bat file. It shouldn't be too hard to modify this batch file to do what you want. -- Make that pile of digital photos presentable: http://ourdoings.com/ It's quicker and easier than you think. |
#6
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The moral of the story is:
1 - DON'T EDIT ORIGINAL IMAGES (leave original prime date prime and unmodified) 2 - only edit or work on copies of the originals (preferably after entring IPTC data) 3 - store data of prime digital images away from and separate to work in progress edited copies 4 - well, all above IMHO Aerticus "Bruce Lewis" wrote in message ... JHoffnagle writes: I'd also recommend updating/replacing any application that trashes the EXIF data fields - in the long run you won't regret it. I think Huffy is right on with that comment. However, if you have some application that you can't update or still trashes EXIF information, another step you can take is to rename the files with the date/time they were taken. This can be done in a batch with the free jhead program. You can also rotate according to your orientation sensor with jhead if you've also installed jpegtran. Download an example of jhead/jpegtran usage from he http://img.ourdoings.com/windows.html (I got the impression you were on Windows. If you're on Linux there's a link from there to the Linux version.) After you download it, look at the short do.bat file. It shouldn't be too hard to modify this batch file to do what you want. -- Make that pile of digital photos presentable: http://ourdoings.com/ It's quicker and easier than you think. |
#7
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Terry Pinnell writes:
I suspect I'm being unduly optimistic in hoping this is a question with a relatively simple answer! Yes, in my experience that's correct :-(. When I browse folders of old photos, I would often like to know the precise date and time they were taken. But the EXIF data is missing for many. Presumably EXIF info must have existed for *all* of them when I first downloaded the DSC000xxxx.jpg images from my Sony Cybershot DSC-1 to my PC, but editing has destroyed it? Most likely. I mean, you *could* have run a specific program to remove it, but you'd probably remember doing that :-). Does anyone have or know of an up to date list of all operations by specific graphic editing programs which result in such destruction of the EXIF data please, so that I can make a point of avoiding them? No. (Since you carefully asked for a list that's both *complete* and *current*, no, nobody has it. But if I'm wrong and you get it, forward a copy to me too please?) Am I right that although Operation X in Program A might preserve EXIF, Operation X in Program B, or Operation Y in Program A (etc) might destroy it? IOW, it's something of a mess? If so, I guess the safest bet is to keep a copy of those originals, or at least a compact list of some sort of their EXIF dates, for future reference if it's inadvertently lost? So far as I've found, it's at the program level, not the operation level. Although possibly (haven't found an example yet) save vs. save-as might give different results. I *did* just discover that when Irfanview writes IPTC data (not quite the same issue) it appears to delete one field (sub-location) if it's present. Bummer. But that's the only single-field example of damage to data embedded in image files that I've found. So far. -- David Dyer-Bennet, , http://www.dd-b.net/dd-b/ RKBA: http://noguns-nomoney.com/ http://www.dd-b.net/carry/ Pics: http://dd-b.lighthunters.net/ http://www.dd-b.net/dd-b/SnapshotAlbum/ Dragaera/Steven Brust: http://dragaera.info/ |
#8
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"Terry Pinnell" wrote in message
... ... Does anyone have or know of an up to date list of all operations by specific graphic editing programs which result in such destruction of the EXIF data please, so that I can make a point of avoiding them? ... I don't have a list, but I can recommend a kind of solution. The free image viewer IrfanView can write out the EXIF data to a file. It can even do it in batch mode. If you're able to do simple programming in a scripting language it would be very easy to set it up to do something like: For all files in a directory: Extract the EXIF data to a file with the same base name + ".txt" You could run this each time you download images from your camera. Then no matter what your image editor did to the images, you would at least have the text of the original handy. But of course you probably still want to save the original images too. Alan |
#9
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"Terry Pinnell" wrote in message
... ... Does anyone have or know of an up to date list of all operations by specific graphic editing programs which result in such destruction of the EXIF data please, so that I can make a point of avoiding them? ... I don't have a list, but I can recommend a kind of solution. The free image viewer IrfanView can write out the EXIF data to a file. It can even do it in batch mode. If you're able to do simple programming in a scripting language it would be very easy to set it up to do something like: For all files in a directory: Extract the EXIF data to a file with the same base name + ".txt" You could run this each time you download images from your camera. Then no matter what your image editor did to the images, you would at least have the text of the original handy. But of course you probably still want to save the original images too. Alan |
#10
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Many thanks for all those helpful replies. Following up several of the
suggested software packages. Looks like I *was* optimistic in looking for a no-brainer solution then! -- Terry, West Sussex, UK |
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