Originally Posted by kjgarrison
I think your dE problem is the value of x. (Too low;fix that)
Low x is the same as low red. In fact, this is a good opportunity to discuss the relationship between xy coordinates and RGB balance for white.
x: controls red. Below 0.3127 is too little red, and above that is too much
y: controls green. Below 0.329 is too little green, and above that is too much
xy together controls blue: Below 0.3127, 0.329 is too much blue, above that is too little.
Y, of course, is luminance only and has no affect on RGB balance.