On the sensation of color

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1877
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Abstract
IT may, perhaps, be worth while to notice a few consequences of three theories concerning color which are usually regarded with some favor.First hypothesis.-Theappearance of every mixture of lights depends solely on the appearances of the constituents, without distinction of their physical constitution.This I believe is established.&cond hypothesi-s.-Everysensation of light is compounded of not more than three independent sensations, which do not influence one an0ther.This is Young's theory.It follows that, if we denote the units of the three elementary sensations by i, j, amI k, every sensation of light may be represented by an expression of the form, Xi+Yj+Zk.Third hypothesis.-Theintensity of a sellsation is proportional• to the logarithm of the strength of the excitation, the barely perceptible excitation being taken of unit strength.Negative logarithms al'e to be taken as zero.'l'his is Fechner's law.It is known to be approximately and only approximately true, for the sensation of light.From this it follows that, if x, y, z be the relative proportions of a mixture of three lights giving the elementary sensations i, j, k, the sensation produced by the mixture is I loga:.i+Jlogy.j+Klogz.k,where I, J, K, are three constants.From these principles, it follows that if a light giving any sensation such as that just written have its intensity increased in any ratio r, the resulting sensation will be,
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Authors Charles S. Peirce
Journal american journal of science
Year 1877
DOI
10.2475/ajs.s3-13.76.247
URL
https://ajsonline.org/article/63770.pdf
Keywords Keywords not found

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