wrote in message
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In message
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(Philip Homburg) wrote:
SNIP
it might be useful to start with more common ones, such as D50.

I've never heard that terminology before. Is that sunlight?

http://www.brucelindbloom.com/CIESpe...alculator.html
graphically shows the spectral contribution of several "Reference
illuminants" as per CIE.
D50 is somewhat similar to a light source of 5000 Kelvin color
temperature, a bit warmer than 'average' daylight, the native color
temperature of calibration target references.

Bart