all joking aside, I am not sure why this relatively simple process is being drawn out. A wise official told me that just because the rule says light on light is illegal, doesn't mean that dark on dark isn't even though it doesn't say that, it is implied. So... an inverse relationship. The human eye can detect about 10 m colors, but some of us, males particularly can have some color blindness and see most colors just fine, but can't pick out small differences in shade, etc... I know this because I are one. But that wise official gave me an idea, look at the inverse of the colors for the answer.
So, White is on a RGb scale, (255,255,255), so black is (0,0,0) the inverse. In Macromedia Fireworks there is a filter that you can apply to any picture. It will examine the picture pixel by pixel, then turn that color into its inverse. This allows you to see relatively simply if the colors contrast, because if they contrast in what you see now, they should contrast when you invert all colors.
ETSN gives us a lot of material to test this theory on.
for example..
The attached visitor jersey clearly contrasts.. there is no question, so not surprisingly the inverse also contrasts starkly. However, the home jersey here, some might say that contrasts enough for me, but if you look at the inverse in parts where there is no glare from the flash, the inverted colors are almost identical and not contrasting.