This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Cleaning od spots, dirt and dust due to age. Enhancement of contrasts, lower saturation of the portrait. With GIMP.
This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: Henry Morton Stanley, photograph. You can see its nomination here.
Licensing
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain in its source country for the following reason:
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The author died in 1888, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.