Hello, I am getting weird results out of spec2cie when converting spectral data to CIE data by using a custom illuminant. First I tried spotread (spotread -v -s -c1 -a CustomTest_spotread.sp) to get ambient emission curves to be saved as an .sp file. I also tried illumread (illumread -v -c1 CustomTest_illumread.sp) but the results after converting with spec2cie are even further off. I have spectral remission data that I measured using the same device (i1Pro 2) with chartread (chartread -v -c1 -p -L -S TEST) which I am trying to convert from spectral data to LAB using the custom illuminant with spec2cie -v -n -i CustomTest_xxx.sp spectral.ti3 cie.ti3 Although the CCT of the emission curves shows me a value of around 5850K I am getting LAB results that are completely blueish and have nothing to do anymore with the original spectral color. To compare the results I am using Bruce Lindbloom's Spectral Calculator Spreadsheets (10nm) (http://www.brucelindbloom.com -> Calc -> Spectral Calculator Spreadsheets -> scroll down for 10nm Download) where it's possible to fill one custom spectral (remission) column and a custom (emission) illuminant and the results there are correct IMHO. Using regular spec2cie with -i D50 I get: 2° LAB 91.21 / 0.15 / 4.34 With the Spreadsheet I get: 2° CustomIlluminant_spotread: LAB 91.12 / -0.47 / 4.49 2° CustomIlluminant_illumread: LAB 91.04 / -1.12 / 4.50 With spec2cie I get: 2° CustomIlluminant_spotread: LAB 91.12 / -4.29 / -4.91 2° CustomIlluminant_illumread: LAB 91.04 / -12.35 / -20.10 Am I doing something wrong? Attached I am sending the TEST.ti3 spectral remission data, both CustomIlluminant_spotread/illumread.sp and the Spreadsheet of Bruce Lindbloom to fill the r/emission data. Thanks for your help in advance if you can provide any. Best regards, Joe Tschudi
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TEST.ti3
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CustomTest_illumread.sp
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CustomTest_spotread.sp
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SpectralCalculator10nm.xls
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