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An Eye for All Seasons

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The human visual system is able to adapt its sensitivity so as to compensate, to a considerable extent, for changes in the level and the color of the illumination. The means whereby this adaptation is provided include: changes in the diameter of the iris; changes between cone and rod vision; bleaching of the visual pigments in the receptors; adjustments to the amplification of the electronic signals produced by the receptors; and cortical effects. The extent of the compensation is not complete, so that the color appearance of objects is only approximately constant. Because original scenes and images often involve various levels and colors of illumination, the effects of this incomplete adaptation can have important implications for producing satisfactory pictures. The recent availability of an agreed Color Appearance Model (CIECAM97s) with its included Chromatic Adaptation Transform (CAT97), and a derived Color Inconstancy Index (CON97), now make it possible to allow for these effects quantitatively.
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Document Type: Research Article

Publication date: January 1, 1998

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

    Please note: for Purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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