Measuring the Transmittance of Transparency Print using a Reflectance Measurement Instrument
Abstract:This paper describes a method to derive spectral transmittance data from spectral reflectance measurement data. The model was verified with colors of the IT8.7/3 color charts. The spectral reflectance of printed colors was measured with an automated reflectance measurement system by placing the transparency sheet on the measurement table with paper backing. The spectral transmittance of these color patches was also measured manually for comparison. The combined transparency and backing reflectance data were used to derive the transmittance data based on a special model. The CIELAB color differences between the model-derived transmittance data and the actual measured transmittance data were computed. The average, maximum and standard deviation of CIELAB color differences between the model-derived data and the actual transmittance data for the 928 colors were found to be 1.6, 8.7 and 1.21, respectively. There were generally larger deviations for darker colors due to lower signal noise ratios.
Document Type: Research Article
Publication date: 2000-01-01
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