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I would really like to see a study on that. Take a color then slowly remove the contrast and ask when the change is discernible. Take a color then slowly transition to another color and ask the same question. Maybe do that with a few hundred people of both sexes and record the differences.
But it'll have to take into account where people are from. In Northern countries for example, it wouldn't surprise me if the difference between blues and whites is much more prominent than reds (snow vs not snow). Or for those living in the jungle all their lives, or those living in cities all their lives, and so on. I'm sure there'll be obvious differences depending on origin and sex.
There's definitely studies on it. I don't know how they measure them, but it's all about the number and type of cones in your eyes because there are a few different types that see different colors. This is why tigers are orange - because their prey lack the cones that see red, so the tigers look like the rest of the background foliage.