Use of digital images to estimate CIE color coordinates of beef |
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Authors: | RE Larraín DM Schaefer JD Reed |
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Affiliation: | aDepartment of Animal Sciences, University of Wisconsin, Madison, WI 53706, United States bDepartamento de Ciencias Animales, Pontificia Universidad Católica de Chile, Santiago, Chile |
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Abstract: | The objective of this study was to evaluate the use of digital images (DI) to estimate CIE L*a*b*, hue angle and chroma of beef, as compared to a colorimeter (CM). Loin samples from 21 steers finished with high-grain diets were displayed under retail-simulated conditions. Color readings were obtained from 63 cores covering the full spectrum of discoloration in beef. CIE L*, a*, and b* were measured with a surface-reflectance CM. Red, green and blue (RGB) values were obtained from DI and sequentially transformed to XYZ and CIE L*a*b* color space. Hue angle and chroma were calculated from a* and b* values. Regressions of CM on DI for a*, hue angle and chroma had R2 values of 0.93 and above. Average color difference ( ) between the predicted and the actual CM L*, a*, and b* values for 13 samples that were not included in the regressions was 1.57, below reported thresholds of detection for 50% of observers. Color readings from DI could be used to accurately predict color coordinates measured by CM, especially a*, hue angle and chroma. Use of digital imaging could become a practical tool to detect changes in beef color and other muscle foods. |
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Keywords: | Beef color Digital images RGB Colorimeter CIE L*a*b* |
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