Desktop scanning to sRGB

To achieve high image quality throughout a digital imaging system, the first requirement is to ensure the quality of the device that captures real-world physical images to digital images, for example a desktop scanner. Several factors have influence on this quality: optical resolution, bit depth, spectral sensitivities, and acquisition noise, to mention a few. In this study we focus on the colorimetric faculties of the scanner, that is, the scanner's ability to deliver quantitative device-independent digital information about the colors of the original document. We propose methods to convert from the scanner's device-dependent RGB color space to the standard device-independent color space sRGB. The methods have been evaluated using several different desktop scanners. Our results are very good: mean CIELAB (Delta) E*ab color errors as low as 1.4. We further discuss advantages and disadvantages of a digital color imaging system using the sRGB space for image exchange, compared to using other color architectures.

[1]  Henry R. Kang.  Color Technology for Electronic Imaging Devices , 1997 .

[2]  H. Ives.  The transformation of color-mixture equations from one system to another , 1915 .

[3]  James Lee Hafner,et al.  Performing color space conversions with three-dimensional linear interpolation , 1995, J. Electronic Imaging.

[4]  J. Cohen,et al.  Color Science: Concepts and Methods, Quantitative Data and Formulas , 1968 .

[5]  Maureen C. Stone,et al.  Color gamut mapping and the printing of digital color images , 1988, TOGS.

[6]  Lindsay W. MacDonald.  Gamut Mapping in Perceptual Colour Space , 1993, Color Imaging Conference.

[7]  Henry R. Kang.  Color scanner calibration , 1992 .

[8]  A. Ravishankar Rao,et al.  Color Calibration of a Calorimetric Scanner Using Non-Linear Least Squares , 1998, PICS.

[9]  James M. Kasson,et al.  Printing CIELAB images on a CMYK printer using trilinear interpolation , 1992 .

[10]  Mark D. Fairchild,et al.  Psychophysical evaluation of gamut mapping techniques using simple rendered images and artificial gamut boundaries , 1997, IEEE Trans. Image Process..

[11]  Peter G. Engeldrum,et al.  Color scanner colorimetric design requirements , 1993, Electronic Imaging.

[12]  Sarah A. Rajala,et al.  Interpolation of Color Data , 1993, Color Imaging Conference.

[13]  Norimichi Tsumura,et al.  Color Gamut Mapping based on Mahalanobis Distance for Color Reproduction of Electronic Endoscope Image under Different Illuminant , 1997, CIC.

[14]  Hiroaki Kotera,et al.  CIELAB to CMYK Color Conversion by Prism and Slant Prism Interpolation Method , 1994, Color Imaging Conference.

[15]  Jan P. Allebach,et al.  Gamut Mapping Squeezing the Most out of Your Color System , 1994, CIC.

[16]  Kevin E. Spaulding,et al.  UltraColor: a new gamut-mapping strategy , 1995, Electronic Imaging.

[17]  Gunther Wyszecki,et al.  Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd Edition , 2000 .

[18]  Brian A. Wandell,et al.  Water into wine: converting scanner RGB to tristimulus XYZ , 1993, Electronic Imaging.

[19]  Jan Morovic,et al.  To develop a universal gamut mapping algorithm , 1998 .

[20]  Po-Chieh Hung,et al.  Colorimetric calibration in electronic imaging devices using a look-up-table model and interpolations , 1993, J. Electronic Imaging.

[21]  Matthew Anderson,et al.  Proposal for a Standard Default Color Space for the Internet - sRGB , 1996, CIC.

[22]  Po-chieh Hung,et al.  Colorimetric calibration for scanners and media , 1991, Electronic Imaging.

[23]  Edward J. Giorgianni,et al.  Digital Color Management: Encoding Solutions , 1998 .

[24]  L. V. Eycken,et al.  Evaluation of Uniform Color Spaces Developed after the Adoption of CIELAB and CIELUV , 1994, Color Research & Application.

[25]  Hiroaki Kotera,et al.  Novel color transformation algorithm and its applications , 1990, Other Conferences.

[26]  Hans Brettel,et al.  Color Management for Color Facsimile , 1996, Color Imaging Conference.

[27]  Jon Yngve Hardeberg.  Acquisition and reproduction of colour images: colorimetric and multi-spectral approaches , 1999 .

[28]  Hideaki Haneishi,et al.  Colorimetric Precision in Scanner Calibration Using Matrices , 1995, International Conference on Communications in Computing.

[29]  Tony Johnson,et al.  Methods for characterizing colour scanners and digital cameras , 1996 .