File:Scanned image without paper texture.jpg

Description
English: A grayscale illustration from a scanned book having the noisy paper texture removed and converted to greyscale using the following Imagemagick command:
convert foo.ppm -level-colors 'rgb(40,40,40),rgb(180,180,160)' -type Grayscale foo.jpg
Date
Source https://archive.org/stream/kinematicsofmach00reuluoft#page/46/mode/2up
Author
Franz Reuleaux (1829–1905)  wikidata:Q62409 s:en:Author:Franz Reuleaux
 
Franz Reuleaux
Description German engineer and university teacher
Date of birth/death 30 September 1829 Edit this at Wikidata 20 August 1905 Edit this at Wikidata
Location of birth/death Eschweiler-Pumpe Berlin-Charlottenburg, Germany
Work period from 1846
Work location
Switzerland, Germany
Authority file
creator QS:P170,Q62409
Permission
(Reusing this file)
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Scanned_image_without_paper_texture.jpg
Category:PD US expired
Other versions
Category:Image processing
Category:Image processing Category:PD US expired