that's the rgb compliment[1], this app uses the traditional colour wheel[2] 1: https://en.wikipedia.org/wiki/Complementary_colors#Colors_produced_by_light http

that's the rgb compliment[1], this app uses the traditional colour wheel[2] 1: https://en.wikipedia.org/wiki/Complementary_colors#Colors_produced_by_light https://en.wikipedia.org/wiki/Complementary_colors#Colors_pr... 2: https://en.wikipedia.org/wiki/Color_wheel https://en.wikipedia.org/wiki/Color_wheel