Visual Color and Color Mixture: The Fundamental Color Space

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University of Illinois Press, 2001 - 218 Seiten
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This volume elucidates Jozef B. Cohen's matrix-R formulation of the algebra of color matching and color mixing. Cohen's method of colorimetric calculation, for which he received the Macbeth Award from the Inter-Society Color Council in 1992, continues to exert a pervasive impact on the color-science community.

Visual Color and Color Mixture develops Cohen's signal achievement from its historical sources. It provides a thorough explanation of the implications of metamerism that will be of considerable use to researchers in industries concerned with the use of colorants, as well as to colorimetrists and color scientists.

 

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Seite 13 - Now, as it is almost impossible to conceive each sensitive point of the retina to contain an infinite number of particles, each capable of vibrating in perfect unison with every possible undulation...
Seite 13 - The objector's hypothesis, as to the fundamental part of it, is not against me. That fundamental supposition is, that the parts of bodies, when briskly agitated, do excite vibrations in the ether, which are propagated every way from those bodies in straight lines, and cause a sensation of light, by beating and dashing against the bottom of the eye, .something after the manner that vibrations in the air cause a sensation of sound, by beating against the organs of hearing.
Seite 15 - From three simple sensations, with their combinations, we obtain seven primitive distinctions of colours; but the different proportions, in which they may be combined, afford a variety of traits beyond all calculation. The three simple sensations being red, green, and violet, the three binary combinations are yellow, consisting of red and green; crimson, of red and violet; and blue, of green and violet; and the seventh in order is white light, composed by all three united.
Seite 5 - tis a Sense of that Motion under the Form of Sound ; so Colours in the Object are nothing but a Disposition to reflect this or that sort of Rays more copiously than the Rest; in the Rays they are nothing but their Dispositions to propagate this or that Motion into the Sensorium, and in the Sensorium they are Sensations of those Motions under the Forms of Colours.
Seite 5 - For the rays, to speak properly, are not coloured. In them there is nothing else than a certain power and disposition to stir up a sensation of this or that colour.
Seite 15 - we read that " the sensations of various kinds of light may also be combined in a still more satisfactory manner by painting the surface of a circle with different colours, in any way that may be desired, and causing it to revolve with such rapidity that the whole may assume the appearance of a single tint, or of a combination of tints, resulting from the mixture of the colours.
Seite 122 - The theory of colours, with all these marvellous and complicated relations, was a riddle which Goethe in vain attempted to solve ; nor were we physicists and physiologists more successful. I include myself in the number ; for I long toiled at the task without getting any nearer my object, until I at last discovered that a wonderfully simple solution had been discovered at the beginning of this century, and had been in print ever since for any one to read who chose. This solution was found and published...
Seite 13 - I take to be this — that the agitated parts of bodies, according to their several sizes, figures, and motions, do excite vibrations in the ether of various depths or bignesses, which, being promiscuously propagated through that medium to our eyes, effect in us a sensation of light of a white colour...
Seite 111 - For I could never yet by mixing only two primary Colours produce a perfect white. Whether it may be compounded of a mixture of three taken at equal distances in the circumference I do not know, but of four or five I do not much question but it may.
Seite 122 - Dr. Young supposes that there are in the eye three kinds of nerve-fibres, the first of which, when irritated in any way, produces the sensation of red, the second the sensation of green, and the third that of violet. He further assumes that the first are excited most strongly by the waves of ether of greatest length ; the second, which are sensitive to green light, by the waves of middle length ; while those which convey impressions of violet are acted upon only by the shortest vibrations of ether.

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