I'm sorry I don't know what I was thinking.
=If(sum(Value) >= 1000000,
I added the ROUND function incase Qlikview doesn't convert a decimal to an integer.
This should move it from Bright Green to White
Problem though when inserting this code into the Pivot chart. It will not group the SUM(Value) by the dimension.
So I'm not sure if this will do it for you.