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Are Chroma-Tolerances Dependent on Hue?

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CIE94 is the latest recommendation on color-difference formulas made by the International Commission on Illumination. The strongest trend incorporated by this formula is a linear dependence for chroma-tolerances with chroma. A potential hue-angle dependence for chromatolerances, as proposed by Dr. Kim at the University of Leeds, could have been masked in previous experiments. We have tested this potential hue-angle dependence through a new experiment, where chroma-tolerances have been measured with a CRT device by 12 observers, using a constant level of L*= 40, two chroma values of C*=20 and 40, and 12 hue-angles at 30° intervals for each one of these chroma values. Our results support the existence of a hue-angle dependence for chroma-tolerances, and agree with Kim's model proposed for this dependence. However, from the experimental data set employed by the CIE TC1-47 for the development of the forthcoming CIEDE2000 formula, we have found that the hue-angle dependence for chroma-tolerances for reported here is not a consistent effect.
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Document Type: Research Article

Publication date: January 1, 2002

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  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    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 papers for details.

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