No abstract
Efforts to construct end-to-end color reproduction systems based on the preservation of scene spectral data have been underway at the Munsell Color Science Laboratory (MCSL). The goal is to present hardcopy results which are spectrally matched to original colors. The evaluated approach consists of capturing scenes through a trichromatic digital camera combined with multiple filterings followed by an image processing stage and then four-color printing. The acquisition end is designed to estimate original scene spectra on a pixel-by-pixel basis based on system characterizations which takes into account the camera sensitivities as modulated by the filterings and scene colorant make-up. The spectral-based printing used in this research is able to produce the least metameric reproduction to the original scene using a computationally feasible approach. Results show a system accuracy of mean ∆E* 94 of 1.5 and spectral reflectance rms error of 0.9%. Keywords: multi-spectral imaging, multi-channel image acquisition, spectral printing, spectral reproduction, MVSI LIMITATIONS OF TRADITIONAL IMAGE REPRODUCTION SYSTEMSCurrent graphic arts reproduction techniques of image capture, scanning, proofing and printing are still heavily entrenched in the traditions of densitometry and crafts experience. Color Management Systems which rely on colorimetry find use. Particularly the MARC project in European museums showed the feasibility of an end-to-end scene to hardcopy colorimetric color management system for artwork reproduction.1 This project was very successful in producing high-quality reproductions that matched the original painting under controlled illumination. These approaches can be used to produce pleasant hardcopy or an accurate hardcopy under a controlled environment, but for critical color-matching applications such as catalog sales and art-books these techniques can often lead to color reproductions which lack appropriate accuracy. Multichannel Visible Spectrum Imaging (MVSI), also known as spectral imaging, offers better accuracy at the expense of more system complexity and higher system bandwidth demands.2-6 Developing an MVSI color reproduction system is described here.A variety of camera approaches are available for MVSI systems. 7-15 The Munsell Color Science Laboratory (MCSL) has given a great deal of attention to two different general categories. The first is a narrow band approach. [7][8][9][10][11] Results have been reported on the use of placing a narrow bandpass tunable filter in front of a monochrome sensor. 10,11,15 Both CCD 15 and panchromatic black and white film 11 have been utilized as such sensors. These systems are analogous to using a spectrophotometer sampling the visible spectrum at known bandpass and wavelength interval. The second category, which has received a large amount of attention from the MCSL, has been a general wide band approach. [12][13][14][15] Again, a number of publications have reported the results of using a conventional trichromatic digital camera combined with absorptio...
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