Many people have a degree of color-blindness. They are unable to distinguish certain colors or shades of colors from others. Some people see only in 'black and white.'
Technically speaking, black is not a color at all. Color is the way we perceive light of a given frequency; if it has a wavelength that is, say, 510 nanometers, then we perceive green light. Black, however, is an absence of light. Therefore, black is not a color at all, rather, it is an absence of color. Unless you are speaking of subtractive colors - then black is the presence of all color and white is the absence of all color. Additive color is light - subtractive color is the color that light bouncing from an object creates.
Feral pigs (like all pigs) have dichromatic vision. Their eyes have cones sensitive to wavelengths in the blue-green portion of the spectrum, but it is unclear whether this translates to color perception in the way we humans understand it. They do not seem to perceive contrast the same way that we do (although they DO perceive it) and only have depth perception within 15 degrees of either side of the snout. They have very sensitive peripheral vision that is particularly good at detecting lateral motion. From a practical standpoint, this means that you are essentially invisible to a feral pig if you are wearing clothing of the same tonal value (regardless of color) as your surroundings and do not move laterally relative to the pig's head.
Everybody is different and have different point of views. It would not be correct to impose a way of thinking to a human. It is better with everybody thinking different. Can you imagine a world with everybody thinking the same. What if what they all thought was not the correct decision. It is sometimes better to have different point of views.
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