Scientific Examination of Art Modern Techniques in Conservation and Analysis (2005) / Chapter Skim
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Color-Accurate Image Archives Using Spectral Imaging--Roy S. Berns
Color-Accurate Image Archives Using Spectral Imaging--Roy S. Berns
Pages 105-119
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From page 105... ...
Carlson Center for Imaging Science Rochester Institute of Technology Rochester, New York ABSTRACT Digital imaging that includes spectral estimation can overcome limitations of typical digital photography, such as limited color accuracy and con straints to a predefined viewing condition or a specific output device. An example includes the use of ICC color management to generate an archive of images rendered for a specific display or for a specific printing technol ogy.
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At the end of this paper are relevant publications written by students, faculty, and staff of the Munsell Color Science Laboratory. TECHNICAL APPROACH Complete Sampling -- Spectral Measurement A spectrophotometer records spectral reflectance or transmittance for a specific circular aperture; a single color is measured.
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Figure 2 is an image of the well-known color target, the GretagMacbeth ColorChecker Color Rendition Chart. This independent evaluation target provides a method to benchmark color and spectral accuracy.
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108 SCIENTIFIC EXAMINATION OF ART FIGURE 2 GretagMacbeth ColorChecker Color Rendition Chart. 1 0 1 Reflectance factor 0 1 0 1 0 400 700 400 700 400 700 400 700 400 700 400 700 Wavelength (nm)
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. If we measure the spectral absorption properties of the colorant using a spectrophotometer and determine the relationship between camera signals and concentration and between concentration and spectral reflectance (e.g., Kubelka-Munk theory, Beer's law)
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Three, six, or nine image planes (each triplet is the usual red, green, blue image) are related to three, six, or nine statistical colorants or directly to spectral reflectance.
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At each wavelength, there should be at least one peak or valley. Spectral Advantage A spectral image archive has a number of advantages over many current image archives.
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Issues include spectral accuracy, colorimetric accuracy, hardware complexity and cost, software complexity, image capture time, data storage, ease of use, maintenance, and system duplication complexity. One of the research goals is to describe these trade-offs in order to provide museums, archives, and libraries with information to assist them in making practical decisions regarding the incorporation of spectral imaging into their imaging practices.
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Analysis of multispectral image capture. In Proceed ings of the IS&T/SID Fourth Color Imaging Conference Color Science, Systems, and Applications, pp.
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A comparative analysis of spectral reflectance recon struction in various spaces using a trichromatic camera system. In Proceed ings of the IS&T/SID Seventh Color Imaging Conference: Color Science, Sys tems, and Applications, pp.
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Color manage ment within a spectral image visualization tool. In Proceedings of the Eighth Color Imaging Conference: Color Science and Engineering, Systems, Technolo gies and Applications, pp.75-80.
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Imai. A psychophysical experiment evaluating the color accuracy of several multispectral image capture tech niques.
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Spectral imaging target development based on hierarchical cluster analysis. In Proceedings of the IS&T/SID Twelfth Color Imaging Conference: Color Science and Engineer ing: Systems, Technologies, Applications, pp.
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H Multi-spectral image acquisition and spectral reconstruction using a trichromatic digital camera system associated with absorption filters, parts I VIII.
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Day. Comparative study of spectral reflectance estimation based on broad-band imaging systems.
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