"William Sommerwerck" wrote in message
...
I would also dispute that a black and white transmission
would not look ok if it was a purity problem.

I've been trying to reason this through. The best I can come up with is
this...

Whether purity is good or bad, the electron beams have to land
/somewhere/. In a B&W image, it might not matter much if red winds up on
blue, blue on green, and green on red. The result will be /something/
approximating a shade of gray.


Correct, as I explain elsewhere in the thread

Arfa