Douglas G. Walker
Eastman Kodak Company
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Featured researches published by Douglas G. Walker.
IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology | 1993
Douglas G. Walker; Scott Gregory
With the advent of color management systems, and other methods of controlling the color reproduction of computer systems and their imaging peripherals, the use of colorimetric techniques to encode color information is gaining prominence. The calculation of colorimetric quantities to describe reflective materials always involves the use of an illuminant spectrum. This paper examines how the results of these calculations differ as the illuminant is changed from the standard CIE D50 daylight spectrum to a more realistic fluorescent viewing booth lamp intended to simulate D50. Color difference formulae are used to quantify the difference for a wide variety of color printing devices. In the case of certain colors, differences of greater than 6 (Delta) E*ab units are found for virtually all of the devices considered. The interaction of the illuminant spectra with the spectral reflectance of printer colorants is analyzed in some detail. Also, a method is presented which allows for the device specific transformation of colorimetric variables appropriate for one of the illuminants into those appropriate for another illuminant. Finally, recommendations are made concerning the standardization of practical D50 illuminants and their importance to the digital communication of color images.
Archive | 1995
H. Scott Gregory; Christopher M. Heinz; Timothy K. Rodgers; George B. Pawle; Douglas G. Walker
Archive | 1999
Douglas G. Walker
Archive | 2000
Douglas G. Walker; H. Scott Gregory; Robert F. Poe; King F. Choi
Archive | 1998
Douglas G. Walker
Archive | 1999
Douglas G. Walker; Scott Gregory; Robert F. Poe
Archive | 1991
Richard C. Close; H. Scott Gregory; Douglas G. Walker
color imaging conference | 1994
Scott Gregory; Robert F. Poe; Douglas G. Walker
Archive | 1996
H. Scott Gregory; Christopher M. Heinz; Jr Timothy K Rodgers; George B. Pawle; Douglas G. Walker
Archive | 1993
Richard C. Close; Scott Gregory; Douglas G. Walker