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Incomplete Chromatic Adaptation under Mixed Illuminations

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A set of psychophysical experiments was conducted to investigate the state of adaptation between hardcopy and softcopy images when viewed under mixed illuminations. The experimental procedures closely followed the guidelines of the CIE Technical Committee TC8-04 Adaptation under Mixed Illumination Conditions. Three chromatic adaptation transforms (CMCCAT97, CMCCAT2000 and CIECAT94) and the S-LMS mixed adaptation model were evaluated. Each chromatic adaptation transform includes an adaptation ratio. This experiment was intended to find the best ratio for each model. Paired comparison technique was used to determine the degree of colour match between the print originals and softcopy reproductions viewed under different illuminants (or white points). The simultaneous binocular matching method was employed. The experiment was divided into nine phases in accordance with a change of illuminants and luminance levels of the ambient light. Fifteen observers took part in each experimental phase. The results reveal that the state of adaptation of human visual system is about 40-60%, and this is independent of illumination conditions. Reliable CATs with a proper incomplete adaptation ratio are capable of producing appearance colour matches under mixed adaptation. Overall results show that CMCCAT2000 and CMCCAT97 gave better performance than CIECAT94 and S-LMS mixed adaptation model.
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Document Type: Research Article

Publication date: January 1, 2001

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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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