Impossible To Explain (colors of the visible spectrum that we perceive as nonexistent)

On rare instances, some people are said to have far better color preception, and are able to see far more shades of colors than the usual, average individual. Yet this photo was taken using a camera, which see far less shades of color as opposed to human eyesight. The original photo is totally purple, so the fact that it turned into all of these shades is pure strangeness https://www.flickr.com/photos/31391486@N04/27635325536/in/dateposted-public/