(Roughly) Daily


Further to “Believing the evidence of one’s own eyes…” and “The eyes have it…,” a tool for detecting Jpeg files that have been altered: from Error Level Analysis, The Image Error Level Analyser.

Error level analysis shows differing error levels throughout this image, strongly suggesting some form of digital manipulation.

…or in more technical terms,

Error level analysis (ELA) works by intentionally resaving the image at a known error rate, such as 95%, and then computing the difference between the images. If there is virtually no change, then the cell has reached its local minima for error at that quality level. However, if there is a large amount of change, then the pixels are not at their local minima and are effectively original.

-Neal Krawetz, Ph.D. http://www.hackerfactor.com

Cool thing is:  it works.  One simply uploads a jpeg image, then discovers the extent to which one has been bamboozled.

… Oprah’s head has been spliced onto the body of glam actress Ann-Margaret. The manipulation was immediately detected by Ann-Margaret’s fashion designer Bob Mackie, who created the gown.
– from
Time, “Top 10 Doctored Photos”

As we boot up those Photoshop tutorials, we might recall that it was on this date in 1904– the very day that the French Third Republic and the United Kingdom of Great Britain and Ireland signed the Entente Cordiale, and that British mystic Aleister Crowley transcribed the first chapter of The Book of the Law— that Longacre Square in Midtown Manhattan was renamed Times Square, in honor of The New York Times, which was (and is) based there.

Crowd gathered outside The New York Times to get World Series results from a remote scoreboard in October, 1919

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