I am trying to characterize my computer display. I have a failure of additivity. That is, the sum of the individual R, G, and B XYZ values does not equal the XYZ of white. Can you help?
What you have run into is a lack of additivity in your display and you are correct that it might be difficult to accurately characterize. However, there might be hope. For LCDs there is typically a significant black level that is always present and an additive display model can work if this black level is corrected. What you need to do is measure the black and subtract it from each primary (and the white) measurement before checking for additivity (and then add it back in to assess the final color). What your calculation is doing is incorporating that black level 3 times when you sum R + G + B and only once when you measure white. Looking at your numbers, it would appear that the black level is quite high, but that might be possible for this display. It is worth a try. If you look at the technical report from Dec. 1996 on this page you can see a fairly simple example of this procedure.
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