Datacolor User to User Support Group.

> > > No, that defies the laws of color theory; if you fill a room with
> > yellow
> > > light, the eye adapts, and that yellow light looks white. There must
> > be some other
> > > source before your eye can distinguish.
> > 
> > That can't be correct.
> > 
> 
> I guess I will refrain from arguing basic color theory with you, and
refer 
> you to any text on the subject.

Out of curiosity, I tried this yesterday evening: I've projected a
bright yellow image and spent 30 minutes in the room, looking at the
image without any other light source in the room.

And guess what: after that time, the image was still yellow! Maybe my
eyes were a bit less sensitive to yellow, but the color still was
obviously yellow, not white. Must be because my eyes and my brain know
what yellow looks like, so they don't need a direct comparison with a
different color to tell that it is not white. That's pretty logical,
because the brain can learn and remember. Otherwise you'd always need
a dog standing next to a cat to tell which one is the dog!

So you can refer me to any text you like, but this will not change the
personal experience which I can verify anytime. I don't rely on
theoretical papers on the subject as you do, but I try things myself.
This is much more reliable and furthermore it shows me how I
personally experience things, not how it could be in theory.

Also, your whole argumentation about the eye adapting to a white point
is wrong when I watch a movie with the projector. The image is not
always white - it's sometimes mostly green, then red, blue, whatever.
So when the image is white or grey again, you can tell to which color
it's biased, because this bias is not always dominant and so the eye
(or actually the brain) will not filter it out. That's really easy -
try it yourself instead of reading about it and you'll see what I mean.

Regards,

Martin