Image files hold hidden data


	Image files hold hidden data

MayTheClipBeWithYou

6-12-2007 10:46 AM

2875 views

tags:

photography, digital, images, publishing, camera, photos, privacy

MayTheClipBeWithYou says:

Hidden data in JPEG/JPG images may say more about you than you intend. This useful article helps explain what types of metadata to look for and how to manage it.
Discusses fingerprints of digital cameras and watermarking and also lists some *very* interesting cases where people have fallen foul of JPEG's metadata.

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6-13-2007 2:27 PM

thisnamecantbetaken

I did not know this! Incredible! Thanks for the clip!

6-13-2007 2:43 PM

allenmarkowski

Very good to know especially if you are photographing for others. I'll send this clip to some people I know could use this. Thanks for the clip.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/7d5326f5-f7ee-41e0-9b79-264442ed66fe/E09DCC15-22D1-45BA-B167-775D93EE2FC0/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html" href="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html" style="font-size: 11px;">netzreport.googlepages.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html"><STRONG>Digital cameras and image manipulation programs add hidden data to JPEG files. For different reasons, one might want to remove these data before publishing the files on the Internet.</STRONG></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">Metadata can be embedded in different ways. A common way is to store them according to the <A href="http://it.jeita.or.jp/document/publica/standard/exif/english/jeida49e.htm" class="external">Exif specification</A></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">Other popular specifications are the <A href="http://www.iptc.org/IIM/" class="external">IPTC headers</A> defined by the International Press Telecommunications Council (IPTC) and <A href="http://www.adobe.com/products/xmp/" class="external">XMP</A> developed by Adobe Systems.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">metadata can give away potentially sensitive information.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">case of television personality Cat Schwartz (e.g. <A href="http://www.techtv.com/" class="external">TechTV</A>). Schwartz had published a photograph of herself on her <A href="http://www.catschwartz.com/" class="external">personal blog</A>. Because the program she had used to edit the picture did not update the thumbnail, the thumbnail revealed more <A href="http://www.patrick.fremont.ca.us/media/schwartz/" class="external">nude facts</A> than originally intended</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">"location information (GPS) where the picture was taken" enables one to exactly locate the place where the picture was taken</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://netzreport.googlepages.com/hidden_data_in_jpeg_files.html">Several software tools support the removal of metadata. A recommendable one is <A href="http://www.sentex.ca/~mwandel/jhead/" class="external">jhead</A></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/E09DCC15-22D1-45BA-B167-775D93EE2FC0/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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