Mantis shrimp's color vision

Mantis shrimp's color vision being better than human is a misconception. They see way less colors
To see colors the human eye has three types photoreceptors called cones - blue, green and red. The mantis shrimp has 12 of these cones. This invites the assumtion that these shrimp can see way more colors than humans. But through an experimenthttps://www.nature.com/articles/nature.2014.14578, it has been show their color vision isn't very good.
The reason why we can see so many colors with just three receptors is because our brain does a lot of calculations to further interpret the combinations of these colors. The brain of the shrimp doesn't do this.
Sometimes it is stated that they have 16 cones instead of 12, I honestly don't know where that comes from.
== Articles believing in this misconception (the misconceptees) ==
https://www.sciencealert.com/now-we-know-how-the-mantis-shrimp-s-tiny-brain-processes-such-amazing-vision
https://phys.org/news/2013-09-mantis-shrimp-world-eyesbut.html
== References ==