>>51021466presuming you aren't colorblind, your eyes have three different types of retinal cells that respond to different light wavelength ranges.
because of this, to humans, visible light seems to have 3 independent characteristics: brightness, saturation (greyness/vibrancy), and hue (spot along a ROYGBIV line).
color gamut diagrams just show the hue and saturation on a 2D figure and leave brightness alone.
the way they work is that they show what combinations of light wavelengths produce which perceived colors to the eye/mind:
choose any set of primary colors, and the range of hues/saturations that can be emulated is defined by the area inside the convex polygon between them.
basically every display uses a set of red, green, and blue primary colors, so you see triangles of displayable colors like in:
>>51019237adding more primaries gets you stuff like
>>51020640that the figures are rounded is a byproduct of the fact that there is overlap between the red and blue detecting cone cells, which also means that no finite number of primary colors will ever be enough to emulate all perceived colors.
