The colors you can see, depend on the number and the distribution of cones (color receptors) in your eye. You can check this rainbow and measure the shades that you can distinguish: If you can see less than 20 shades: You are a bicolor, like dogs, which means that you have only two types of cones. 25% of the population is dichroic.
If you can see from 20 to 32 shades: You are a trichromatic, you have three types of cones (purple / blue, green and red). You can enjoy various colors. 50% of the population is trichromatic.
If you can see between 33 and 39 shades: Then you are -tetrachromatic- like bees, and you have four types of cone (purple / blue, green, red, yellow). Bothered by the yellow so that it will hardly found any outfit in your wardrobe. 25% of the population is tetrachromatic.
If you can see more than 39 shades: Something goes wrong! There are only 39 different colors in the test and probably only 35 rendered correctly by the computer screen.
It is very likely that people who have four cones, won’t easily fooled by a blue / black or white / gold shade, no matter the brightness and the background color of the photo.