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As you saw, even with booths which match standards, you will see
differences in perceived colors. Roger Breton and I have done a similar
comparison with Just/GMB/GTI/Solux tubes and lamps. You can find the
The tubes are all judicious mixes of phosphors with a spectral response
that intend to match the ideal D50. But their spectral response is
"wavy", going below and over (crossing) the theoretical D50 response at
many wavelengths; this creates metameric mismatches for some colors and
for some ink+media combinations. With all the media and booths you have,
you are in for a headache, and you attempt to standardize is in the good
You will also probably find that the UV content differs widely as well.
The response in UV isn't really specified, and manufacturers often
ignore it, even though it has a very great influence on the fluorescent
whiteners that is used in many papers.
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