- Johannes von Kries
Johannes von Kries (1853–1928) was a German physiological psychologist [cite book | title = Color Codes: Modern Theories of Color in Philosophy, Painting and Architecture, Literature, Music, and Psychology | author = Charles A. Riley II | publisher = Univ. Press of New England, Hanover NH |year = 1996 | isbn = 0874517427 | url = http://books.google.com/books?id=EBmZrXKmARQC&pg=PA299&ots=cNHUcnSI3_&dq=%22Johannes+von+Kries%22+psychologist&as_brr=3&sig=XVgPhdUhAWL8QfEZ25LdkpUDn_4 ] who formulated the modern "duplicity" or "duplexity" theory of vision mediated by
rod cell s at low light levels and three types ofcone cell s at higher light levels. [cite book | title = The Color Sensitivity of the Peripheral Retina | author = John Wallace Baird | publisher = Carnegie Institution of Washington | url = http://books.google.com/books?id=59sjuJRBlZsC&pg=PA24&dq=%22Johannes+von+Kries%22#PPA69,M1 | year = 1905 ] [cite book | title = Dictionary of Theories, Laws, and Concepts in Psychology | author = Jon E. Roeckelein | year = 1998 | publisher = Greenwood Press | isbn = 0313304602 | url = http://books.google.com/books?id=6mu3DLkyGfUC&pg=PA472&ots=yNeflXnlEu&dq=%22Johannes+von+Kries%22&sig=NA_AyrbKQ6xqPaA5nfjscIBmV3g ]When von Kries was at Freiburg, he was called to succeed Professor Du Bois Raymond as chair of physiology at the
University of Berlin , but he declined. [cite journal | title = Scientific News | journal = The American Naturalist | author = American Society of Naturalists, Essex Institute | date = May 1897 | url = http://books.google.com/books?id=zBUuAAAAMAAJ&pg=PA481&dq=%22Johannes+von+Kries%22&as_brr=1#PPA469,M1 ]Von Kries has been called
Helmholtz 's "greatest German disciple". [cite book | title=Hermann Von Helmholtz and the Foundations of Nineteenth-Century Science | author = David Cahan | publisher = University of California Press | year = 1993 | isbn = 0520083342 | url = http://books.google.com/books?id=Gx-ZGgeF2EwC&pg=PA198&ots=YLOpuHJC5o&dq=%22Johannes+von+Kries%22+psychologist&as_brr=3&sig=MHSpccGlpAF4Jvkj28WxP8k4sJM ]See also
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Color balance
*Von Kries transform References
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