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I want to use the CIE CMFs (Color Matching Functions) CMFs

provided here: http://www.cvrl.org/cmfs.htm

With data from my spectrometer in 10 nm increments.

However, the CMFs are only provided at 5 nm increments.

What would be the best way to do this? Would it be okay to resample the spectral data with a linear interpolation? Any ideas?

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  • $\begingroup$ I don't have any expertise on the topic, but looking at the graph you provided, it's certainly looks smooth enough to be up or down-sampled to either 5 nm or 10 nm increments without causing problems (since the major features are on the order of 100 nm wide). I guess it depends on what precision you're looking for, of course. $\endgroup$
    – DumpsterDoofus
    Commented Jan 28, 2014 at 0:13
  • $\begingroup$ So downsampling the functions is better than "upsampling" the measurement? Thanks $\endgroup$
    – adrienlucca.net
    Commented Jan 28, 2014 at 0:21
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    $\begingroup$ Is the graph you provide the measurement or the CMF? If both of them are fairly smooth (compared to the 5 nm or 10 nm step size) then it probably won't make much difference whether you upsample the measurement or downsample the CMF. $\endgroup$
    – DumpsterDoofus
    Commented Jan 28, 2014 at 1:30

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It is absolutely fine to interpolate color matching functions since they are nice and smooth. I would use spline interpolation instead of linear, but with such small increments (5 nm) you will hardly see a difference.

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