I have tried to take photos with a correct white reference for both kinds of display, but it was nearly impossible. Every time I got a different tint due to daylight or artifical light properties, so I gave up.
Here are some more attempts to make good photos of the Nipkow disk screen:
http://fernsehmuseum.net/mechanical/...MitFarbe15.jpg
http://fernsehmuseum.net/mechanical/...MitFarbe14.jpg
http://fernsehmuseum.net/mechanical/...MitFarbe13.jpg
http://fernsehmuseum.net/mechanical/...MitFarbe12.jpg
- Eckhard