Color blindness is usually an inherited condition that makes it difficult to differentiate among shades of colors. Color blindness happens when the cones of the eye are missing specific light sensitive pigments.
Even if you have complete achromatopsia, totally monochromatic vision, it will make everything look like different hues of gray, but only the very darkest shades might appear blackish. Medium shades of red, blue and green will appear gray, not black. See the following for more details and examples. Dr. Astley, an expert in ophthalmology, has a fascinating presentation.
https://youtu.be/oHg5SJYRHA0
Ok I stand corrected on the color of the word... I changed computer contrast and luminosity, which is why I saw that as red.
If it was though I'm still confident he'd see it black (I've witnessed him confused my asking why a book didn't have a title, while it had one written bright red on black).
I'm gonna ask him now I'm curious^^
Even if you have complete achromatopsia, totally monochromatic vision, it will make everything look like different hues of gray, but only the very darkest shades might appear blackish. Medium shades of red, blue and green will appear gray, not black. See the following for more details and examples. Dr. Astley, an expert in ophthalmology, has a fascinating presentation.
https://youtu.be/oHg5SJYRHA0
If it was though I'm still confident he'd see it black (I've witnessed him confused my asking why a book didn't have a title, while it had one written bright red on black).
I'm gonna ask him now I'm curious^^