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I wonder if anyone can help me in identifying when the term "gray scale"
was first used?  The OED suggests 1959 as the first usage, which seems
quite a lot later than I would have thought.  I had always assumed that
it was virtually related to the development of photography.
 
I am also interested when the concept of what Johannes Itten first identified
as a tone value scale developed.  I thought possibly people interested in
the history of film (and or photographic) technology might know.  Many
thanks.
 
				Donald Theall
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