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How much EXIF information is tracked by photo sharing sites?
How much EXIF information is tracked by photo sharing sites?
http://regex.info/exif.cgi I often post photos to photo-sharing sites, whether for the purpose of social networking (pinterest, facebook, etc) or for Usenet posts (tinypic, flickr, etc) or for personal sharing (iCloud, dropbox, google drive, etc). The EXIF, as you know, can reveal exactly where and when the photo was taken, and even what camera was used, and, of course, the time and date, etc, the combination of which could easily reveal intensely personal information. When I DOWNLOAD those pictures, generally (always?) the EXIF information seems to be stripped out. But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? |
#2
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How much EXIF information is tracked by photo sharing sites?
On 10/28/2014 05:54 PM, A. Beck. wrote:
But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? Dude, a few years ago nobody would have thought it possible (or even constitutional) in the western world that social media and cloud services treat your data as their property, that postal service retain every sender/recipient address, that secret services read and store all your e-mails, passwords and browsing profiles. And yet, we were shocked to learn that all this is common practice today. So you just have to assume that every bit of information that leaves your local network is intercepted, stored and evaluated. If it is encrypted it is either decrypted today, or stored for decryption in the future. Sorry to break the news to you. |
#3
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How much EXIF information is tracked by photo sharing sites?
On 2014-10-28 17:04:41 +0000, JF Mezei said:
On 14-10-28 12:54, A. Beck. wrote: But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? If you upload X, assume the web site has X. If that X contains all your EXIF data, assume they keep it. There are utilities to strip EXIF data from a photo. In Photoshop, it isn't so obvious, you have to export to web. That gives you ability to strip most of the exif data out. In Photoshop or Lightroom you can select slightly different levels of EXIF data you choose to include or exclude with the exported image file. Photoshop: None: Copyright; Copyright & Contact Info: All Except Camera Info: All. https://dl.dropbox.com/u/1295663/FileChute/screenshot_996.jpg Lightroom: Copyright Only; Copyright & Contact Info Only: All Except Camera & Camera RAW Info: All Metadata ....and an option to "Remove Location information." https://dl.dropbox.com/u/1295663/FileChute/screenshot_995.jpg -- Regards, Savageduck |
#4
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How much EXIF information is tracked by photo sharing sites?
On 10/28/14 PDT, 10:17 AM, Martin wrote:
On 10/28/2014 05:54 PM, A. Beck. wrote: But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? Dude, a few years ago nobody would have thought it possible (or even constitutional) in the western world that social media and cloud services treat your data as their property, that postal service retain every sender/recipient address, that secret services read and store all your e-mails, passwords and browsing profiles. And yet, we were shocked to learn that all this is common practice today. So you just have to assume that every bit of information that leaves your local network is intercepted, stored and evaluated. If it is encrypted it is either decrypted today, or stored for decryption in the future. Sorry to break the news to you. Evaluated? I suppose if it's a photo of a military installation or some other super secret place, maybe. Nefarious purpose? Unless sensational, or above, what can they really do about knowing you shot a photo of Suzie Q in front of the Prado at 14:55 UMT? |
#5
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How much EXIF information is tracked by photo sharing sites?
On Tue, 28 Oct 2014 13:04:41 -0400, JF Mezei wrote:
If you upload X, assume the web site has X. If that X contains all your EXIF data, assume they keep it. It's one thing to assume, while it's another to actually know. I asked to figure out if anyone actually knows, since I don't. There are utilities to strip EXIF data from a photo. In Photoshop, it isn't so obvious, you have to export to web. That gives you ability to strip most of the exif data out. Yes. I often convert to GIF, just to get rid of the EXIF information: $ convert pic.jpg pic.gif Or, I just strip out the EXIF information: $ for f in *.{JPG,JPEG,jpg,jpeg}; do convert -strip $f $f; done But, the purpose of asking here was to figure out if there are any known cases where the web site made use of the EXIF information. Certainly if you know of a picture-sharing site that *keeps* the EXIF information intact, that would be immensely informative. |
#6
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How much EXIF information is tracked by photo sharing sites?
On Tue, 28 Oct 2014 18:17:35 +0100, Martin wrote:
postal service retain every sender/recipient address I didn't know that the (snail mail) post office retains all from/to information. Is that really true and verified? (or just conjecture?) |
#7
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How much EXIF information is tracked by photo sharing sites?
In article , A. Beck. wrote:
How much EXIF information is tracked by photo sharing sites? http://regex.info/exif.cgi I often post photos to photo-sharing sites, whether for the purpose of social networking (pinterest, facebook, etc) or for Usenet posts (tinypic, flickr, etc) or for personal sharing (iCloud, dropbox, google drive, etc). The EXIF, as you know, can reveal exactly where and when the photo was taken, and even what camera was used, and, of course, the time and date, etc, the combination of which could easily reveal intensely personal information. Sorry, but how is this "intensly personal information"? If you have Lightroom set to add your personal details it would certainly be personal infromation, but hardly "intensly", that would be if you also add your social security number and other more intimate details about yourself. When I DOWNLOAD those pictures, generally (always?) the EXIF information seems to be stripped out. Which just means that the thumbnail, or scaled down version of the image, has EXIF stripped, and that's the version you (and maybe others) can download, meaning they've taken steps to conceal the somewhat personal information there is in the image. But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? While some social web sites surely create a local scaled down version of the image, and toss the original, I'd say most keep the original on disk for future re-scaling. And with regards to the supposed "nefarious" purposes, whatever purposes could they have with knowing your camera model, the date the image was taken and possibly where it was taken? I mean, in theory it could be used to give you ads about going back to Thailand a year after, but that's hardly "nefarious", and if you're the kind of person that thinks targeted ads are nefarious, then you're also the kind of guy that strips the EXIF yourself first, and upload it in another name, using a secure email address :-D -- Sandman[.net] |
#8
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How much EXIF information is tracked by photo sharing sites?
In article , A. Beck. wrote:
JF Mezei: If you upload X, assume the web site has X. If that X contains all your EXIF data, assume they keep it. It's one thing to assume, while it's another to actually know. I asked to figure out if anyone actually knows, since I don't. JF Mezei: There are utilities to strip EXIF data from a photo. In Photoshop, it isn't so obvious, you have to export to web. That gives you ability to strip most of the exif data out. Yes. I often convert to GIF, just to get rid of the EXIF information: $ convert pic.jpg pic.gif Or, I just strip out the EXIF information: $ for f in *.{JPG,JPEG,jpg,jpeg}; do convert -strip $f $f; done But, the purpose of asking here was to figure out if there are any known cases where the web site made use of the EXIF information. Certainly if you know of a picture-sharing site that *keeps* the EXIF information intact, that would be immensely informative. Flickr, obviously, keeps the EXIF data. They display it on the photo page and even the location if you allow it, they also use it to gather statistics about cameras. Not sure what "nefarious" purposes they COULD be using it for. -- Sandman[.net] |
#9
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How much EXIF information is tracked by photo sharing sites?
On Tue, 28 Oct 2014 18:09:04 +0000, Sandman wrote:
Flickr, obviously, keeps the EXIF data. Yikes! I had downloaded images and *never* saw EXIF data in those downloaded images. Are you sure about this? |
#10
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How much EXIF information is tracked by photo sharing sites?
On 28/10/2014 12:54 PM, A. Beck. wrote:
How much EXIF information is tracked by photo sharing sites? http://regex.info/exif.cgi I often post photos to photo-sharing sites, whether for the purpose of social networking (pinterest, facebook, etc) or for Usenet posts (tinypic, flickr, etc) or for personal sharing (iCloud, dropbox, google drive, etc). The EXIF, as you know, can reveal exactly where and when the photo was taken, and even what camera was used, and, of course, the time and date, etc, the combination of which could easily reveal intensely personal information. When I DOWNLOAD those pictures, generally (always?) the EXIF information seems to be stripped out. But ... how much of that personal EXIF information is retained by the web site (and used for their possibly nefarious purposes)? In Photoshop if you use "Save for web" the EXIF is stripped, if you use "save as" it's kept. -- Men make their own history, but they do not make it as they please; they do not make it under self-selected circumstances, but under circumstances existing already, given and transmitted from the past. |
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