Have you considered calibrating a digital camera? They are (perhaps) easier to control, and the colour accuracy might be good enough for you.
Not yet, I wanted to do it the accurate way first. Maybe it is worth an test with an calibrated camera. Hope the precission suffers not too much this way. Have You any experiences doing so?
You can easily get 3 - 4 average dE error on a Macbeth Color Checker Chart with a cheap digital camera. Usually you see very small errors around the neutral axis, and up to (maybe) about 10 on tricky colours like cyan. Of course the lighting geometry is very important, and factors like optical scatter make comparison with true point measurements difficult.
On the plus side, it is non-contact, which is important for paintings.
John
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