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Spectral Colorimetry using LabPQR: An Interim Connection Space

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A method is presented for deriving a conversion from reflectance spectra to a convenient intermediate form introduced as LabPQR. LabPQR is designed for use within a spectral color management system as an interim connection space (ICS) between a reflectance based profile connection space (PCS) and output device digit counts. The LabPQR ICS makes use of a spectral encoding that explicitly incorporates colorimetry. The initial three dimensions of a LabPQR ICS provide a colorimetric representation of reflectance spectra under an illuminant. Additional dimensions define spectral corrections that allow inverse transformation to approximately the original spectra. Consistent with a previously defined spectral color management transformation chain, the PQR dimensions of the ICS can be optimally formulated to suit any specific output device’s spectral rendering capabilities. After describing a method for distilling spectra into, and reconstituting spectra, from LabPQR coordinates, several sample transformations are demonstrated using various output devices. Visualizations follow of some sample LabPQR gamuts. Observations are made, and from these observations, a possible method for performing spectral gamut mapping is proposed. Current methods of color management (specifically using ICC profiles) are discussed relative to LabPQR visualization. In conclusion, proposals are made for future research and possibilities.

Document Type: Research Article


Affiliations: 1: Onyx Graphics, 6915 High Tech Drive, Midvale, Utah 84047 2: Munsell Color Science Laboratory, Chester Carlson Center for Imaging Science, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, New York 14623-5604

Publication date: January 1, 2006

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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