Digital Forensics: 5 Ways to Spot a Fake Photo


	Digital Forensics: 5 Ways to Spot a Fake Photo

Mohir

6-2-2008 2:05 PM

631 views

tags:

photography, fake, forensics

Mohir says:

the 4 other ways in the website

2 Comments |

Add a Comment

6-3-2008 6:15 AM

alanocu

very good! thanks for the link!

6-3-2008 10:15 AM

bignosemousie

The ducks forgot their jackboots!

Login to Comment. Not a member yet? Sign up

View the Top Clips from June 2, 2008

Embed This Clip In Your Site...

<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://www.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/6eafd592-f23a-4d35-be01-a986d8f873dd/D516F80D-C71B-4B53-BB9C-77EA80B8C919/" 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://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss" href="http://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss" style="font-size: 11px;">www.sciam.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss">Composite images made of pieces from different photographs can display subtle differences in the lighting conditions under which each person  or object was originally photographed. Such discrepancies will often go unnoticed by the naked eye.</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://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.sciam.com/img/66FEBFD7-C413-4ABD-9DBA-895F0D94DC51" alt="" /></div></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://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss">For an image such as the one at the right, my group can estimate the direction of the light source for each person or object (arrows). Our method relies on the simple fact that the amount of light striking a surface depends on the relative orientation of the surface to the light source. A sphere, for example, is lit the most on the side facing the light and the least on the opposite side, with gradations of shading across its surface according to the angle between the surface and the direction to the light at each point.</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://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.sciam.com/img/55F930A7-9979-444E-87D5-47F454592EB7" alt="" /></div></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://www.sciam.com/article.cfm?id=5-ways-to-spot-a-fake&sc=rss">  For the image above, the light-source direction for the police does not match that for the ducks (<EM>arrows</EM>). We would have to analyze other items to be sure it was the ducks that were added.</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/D516F80D-C71B-4B53-BB9C-77EA80B8C919/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>

Clipmarks: Home; New Clips; Top Clips; Dashboard

Popular Topics: News; Life; Science; Technology; Entertainment

Get Started: Sign Up; Install Clipping Tool; How Clipping Works; Clip-to-Blog™; ClipSearch

Tools and Resources: FAQ; ClipWeek; Top Clippers; Top Tags; Site Map

About Clipmarks: About Us; Contact; Blog; Copyright; Privacy; EULA

Search Options

Related Clips

More clips from Mohir

Today's Top Clips