[RufflesRidge]

A binary image, has by definition two possible states for each pixel. What color you make the two states appear as really doesn't matter. If you want them to be black and green because you have a green ring light, go for it. If you want them to orange and purple because those are you favorite colors, you can make it do that instead.

Your method seems to be the correct way of having the "true" pixels output as green to me.