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hdr-CIELAB and hdr-IPT: Simple Models for Describing the Color of High-Dynamic-Range and Wide-Color-Gamut Images

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The CIE 1976 L*a*b* Color Space, CIELAB, has been widely and successfully used in a variety of applications including digital color imaging, color image quality, and color management. One of its shortcomings, lack of hue linearity, is a critical problem in color gamut mapping and has been addressed by the IPT color space which is widely used in this domain. One limitation with both of these spaces is their applicability to color problems in high-dynamic-range (HDR) imaging. This is caused by their hard intercepts at zero luminance/lightness and by their uncertain applicability for colors brighter than diffuse white. To address these HDR questions, two newly formulated color spaces are proposed for further testing and refinement, hdr-CIELAB and hdr- IPT. They are simply based on replacing the power-function nonlinearities in CIELAB and IPT with a more physiologically plausible hyperbolic function, known as the Michaelis-Menten equation, optimized to most closely simulate the original color space for the diffuse reflecting color domain. The formulation of these proposed models is described along with some preliminary evaluations using Munsell data in comparison with CIELAB, IPT, and CIECAM02.
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Document Type: Research Article

Publication date: 01 January 2010

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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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