Overheads

ok this puzzles me a bit.

You know the overheads old professors that don't know how to use powerpoint (or refuse to, whatever) uses. What would happen if you make, like, a gigantig overhead. And put a continious strip of color on a transparancy (ignore the fact that we're talking about color PIGMENTS here, so that my "theory" would hold anyway) but is color continious? Like, would you start to see "pixels" on the overhead if you had one sufficiently large? Is color countable, is it discrete or is it continious? With color, i'm more than likely refering to photons with different wavelengths.

Well, it all make sense when you refer to the phrase;
"Looking at the world through rose tinted glasses."
That would explain why a rainbow does not look as spectacular to me than everyone else thinks it to be.
This leads me to muse that perhaps WE are infact the ones that are colour blind. And in actual fact, we are labelling the humans with superior receptiveness to other frequencies as disabled. Should this be a case of discrimination? Are we being ignorant?