0.9x + 0.1y - z = 0 <--- thats a formula for a flat plane in 3d space... someone could generate a 2d flat image of all possible horse colors

.
That would be interesting to see
Edit:
From MATLAB:
>> J = []; for r = 0:255; for g = 0:255; b = 0.9*r + 0.1*g; J(r+1,g+1,1) = r/255; J(r+1,g+1,2)=g/255; J(r+1,g+1,3)=b/255; end; end
>> imview(J)
thats assuming (x,y,z) are (red,green,blue) respectively.
And below is the image produced of all color triplets that obey that formula.
I'm not sure if its correct. Bcuz it looks like 4 colors only (purple, green, white, black), which sucks if its true.
Edit: Idk, maybe thats one of many formulas in use, looking on the CO-website i see more colors than that in the non-rare breeds.
From the CO website:
"[The Steed System] Mount Appearance
When you breed new mounts, you will have a chance to acquire a new breed of mount with a random appearance and color."
They use the word
random it could be that the original color values are used as seed numbers for a random number generator, that generates the next color

... no idea :P
Edit:
Ok definitely not random... Dam lyin TQ
Looking at the other posts in general discussion. The bars, it doesn't look like RGB, RBG, CMY or anythin like that....
I think its HSV,
That is
Hue,
Saturation and
Value.
The Hue being the color on a color wheel.
The Saturation the amount of grey (0% - bw, 100% - color)
The Value the amount of brightness (0% - black, 100% - brightness of color)