How do people see the dress as Black/Blue when the RGB values shows that the color of the dress in the Image is a light purple and a brown ish color?

Question

How do people see the dress as Black/Blue when the RGB values shows that the color of the dress in the Image is a light purple and a brown ish color?

In: Other

Answer 1

Because there are other white objects in the picture, and holding the dress up against these pretty much instantly disqualifies it from being white/gold.