Download Color for Philosophers: Unweaving the Rainbow by C. L. Hardin PDF

By C. L. Hardin

This ebook is provided the 1986 Johnsonian Prize in Philosophy. This accelerated variation of C. L. Hardin's ground-breaking paintings on color contains a new bankruptcy, 'Further strategies: 1993', within which the writer revisits the dispute among color objectivists and subjectivists from the viewpoint of the ecology, genetics, and evolution of color imaginative and prescient, and brings to undergo new information on person variability in color notion.

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Additional resources for Color for Philosophers: Unweaving the Rainbow

Example text

The visual system establishes a reference level and tends to maximize differ­ ences on either side of that reference level. This emphasis on contrast is even-handed, however: a swing in one direction is accompanied by a swing in the opposite sense. The light-dark system comprises what we may call an antagonist or opponent pair: a blackness response and a whiteness response, working on either side of a neutral state which, in moderate illumination conditions, is always a middle gray. An opponent pair is like a spring, a distension or compression of which leads to a reaction 'in the opposite direction-not, however, without .

Proceeding in this way through the spectrum at 10 nm intervals, the greenness and redness responses are calibrated relative to each other, as are the yellowness and blue­ ness responses . Other procedures involving the location of balanced binary hues are used to fit the one opponent pair to the other, so that a consistent and useful set of curves results . The structure of phenomenal hues If you feel uncomfortable with the appeals to subjective quality as­ sessments in this procedure, you will be sharing the sentiments and scruples of the majority of psychophysicists before about 1960.

First, in its present form it is too simple, since there is evidence that some of the interactions, particularly those in­ volving the yellow-blue channel, are nonlinear (Werner and Wooten 1979; Hunt 1982). Second, the choice of sign (e . g . , greenness as nega­ tive, redness as positive) is, at the present state of knowledge, merely conventional. That greenness and redness should be given opposite signs is, of course, essential to the theory. Third, the formulae need to be assigned coefficients that reflect the weighting to be given to each cone type .

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