Detective Allan Pinkerton ("E. J. Allen") of the Secret Service
on horseback in Antietam, Maryland in 1862

CREDIT: Gardner, Alexander, photographer. "Antietam, Maryland. Allan Pinkerton ("E. J. Allen") of the Secret Service on Horseback." September 1862. Selected Civil War Photographs, 1861-1865. American Memory collections, Library of Congress.

Photograph forensic repair in Photoshop by Ralph D. Thomas

Note: Above is a photo of the orginial so you can see the difference
The forensic repair was done using the healing brush as well as brightness and contrast adjustments.

Using various tool in Photoshop, we have been able to provide a retouched blowup
of Pinkerton's face from the photo.

From The Ralph D. Thomas PI Vintage Collection
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