If one or more types of a person's color-sensing cones are missing or less responsive than normal to incoming light, that person can distinguish fewer colors and is said to be color deficient or color blind (though this latter term can be misleading; almost all color deficient individuals can distinguish at least some colors). Some kinds of color deficiency are caused by anomalies in the number or nature of cones in the retina. Others (like central or cortical achromatopsia ) are caused by neural anomalies in those parts of the brain where visual processing takes place.
Kiminpl, WOW! I think your color choices are amazing! Definitely evokes the beach. And the door color is such a stunning and unusual color that you don't see everyday on a house. Thank you for posting. I am almost to the place where I think I need to hire a color consultant. I am really stuck. I play around on those paint websites - did so this morning in fact - and have bought 5 or 6 sample pots of paint- grays and blues - but I feel like I am spinning my wheels and not getting anywhere. The original idea was dark blue, then my new cool roof installed was a lighter gray than I expected on the main body of house....where sun hits it. Much darker gray on my attached garage which is shaded by giant Pine tree. Many folks are painting their house navy in LA -sort of the new 'it" color, but I think it sort of looks funny with lighter gray roofs! Another obstacle seems to be the stucco/wood situation, as my house has both, and I go back and forth between solid or two tone. ARGHHH!!!