256 colors
100% opaque
50% opaque
25% opaque
768 total colors
or
128 colors
" "
384
OR...
RGB = 3
YCM = 3
B&W = 2
^ = 8
8*4(Shades) = 32
32*2(Trans) = 64
So, four shades of red, green, blue, yellow, cyan, and magenta, then 8 grayscale colors.
This totals to 64, the current colorset limit.