Abstract
A new calibration technique for improving the accuracy of chromaticity and luminance values obtained from a tristimulus colorimeter has been developed. Matrix manipulations similar to ASTM standard practice E 1455 are applied with a goal of minimizing the errors in x, y, and Y measurement, rather than those of the tristimulus values X, Y, Z. Correction matrices are determined from CRT colors, as well as CRT colors together with other light-source colors. 15 colors of a CRT and 9 colored filter glasses are measured with a four-channel tristimulus colorimeter using such matrices. The matrix computed from CRT colors reduced CRT measurement errors to < 0.0011 in x, y, and 0.9 % in Y, and the matrix computed from both CRT and glass colors reduced errors to < 0.0025 in x, y and 0
.7 % in Y for both CRT colors and filter colors. Both
cases show improvement over current practice.
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The Authors
C. Leone, S. Sojourner, E. Vargas, UDT,Orlando, FL
C. Cromer, Y. Ohno, J. Hardis, NIST, Gaithersburg, MD
References
1. CIE/ISO 10527 Standard Colorimetric Observers (1991).
2. Wagner, H.G., Farbmessungen an Fernseh-Farbbilddröhren nach dem Driebereichsverfahren," Farbe 22, 31-43 (1973).
3. ASTM E 1455-92 "Standard Practice for Obtaining Colorimetric Data from a Visual Display Unit Using Tristimulus Colorimeters," ASTM Standards on Color Appearance Measurement, 4th Ed.
4. IES LM-58-1994, IESNA Guide to Spectroradiometric Measurements.
Reprinted with permission, SID 96 Digest. |
