16 January 2006 The calibration accuracy of display white point by visual calibrator under various illuminations
Author Affiliations +
Proceedings Volume 6058, Color Imaging XI: Processing, Hardcopy, and Applications; 60580N (2006); doi: 10.1117/12.642799
Event: Electronic Imaging 2006, 2006, San Jose, California, United States
Abstract
We have developed a method to calibrate a display to a predetermined state and to make an ICC display profile by visual calibration for soft proofing. Our method adjusts a color of display white point to a color of a white object under a viewing illuminant, so our method can calibrate the display white point for any viewing illuminant. In order to calibrate the tone reproduction curve of a display, the brightness and hue of a continuous tone image is adjusted to the brightness and hue of a binary image. In addition, three pairs of images having different values of brightness are used. These methods can calibrate the display which has complex tone reproduction curve like LCD displays. In Electronic Imaging 2005, we reported that these methods can calibrate tone reproduction curves of LCD displays accurately1. In this paper, we evaluated the matching accuracy between display white point and paper white under various illuminances and color temperatures to bear out the effect of our method under practical illumination. We found from this experiment that the matching accuracy was almost the same in all illumination conditions. Furthermore, all subjects calibrated the chromaticity of display white point more bluish than the chromaticity of paper white in all illumination conditions, and the dispersion of yellow-blue direction was larger than that of red-green direction. This yellow-blue direction was almost the same as the long axis of MacAdam ellipse. We also evaluated the capability of color discrimination between display and paper in various illumination conditions. At 500lx or less, many subjects made judgments that the color of display white point was similar as the color of paper white when color difference between display and paper was small, but the correlation of color difference with judgement was small at 1000lx or more. The cause of these results is the maximum luminance of the display was darker than that of paper at 1000lx or more. These results suggest that ISO 3664:2000 P2 condition is appropriate to compare the image on computer display with that on paper at the same time.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tohru Sugiyama, Yoshiaki Kudo, "The calibration accuracy of display white point by visual calibrator under various illuminations", Proc. SPIE 6058, Color Imaging XI: Processing, Hardcopy, and Applications, 60580N (16 January 2006); doi: 10.1117/12.642799; https://doi.org/10.1117/12.642799
PROCEEDINGS
10 PAGES


SHARE
KEYWORDS
Calibration

LCDs

Visualization

Binary data

Color difference

Lamps

Spectrophotometry

RELATED CONTENT

Color image quality in projection displays: a case study
Proceedings of SPIE (January 17 2005)
Gray tracking correction for TFT-LCDs
Proceedings of SPIE (December 18 2003)
Are the color gamuts of CRT and LCD triangular? ...
Proceedings of SPIE (June 30 2000)
A smoothness metric for colour transforms
Proceedings of SPIE (January 28 2008)

Back to Top