As for something being “green”, we can detect “green” with webcams and computers. My Gimp as a “anti-red eye filter” that can not only detect a kind of red and even its shape, and remove it. Being green is a very physical property of light, or of matter that emits/absorbs light. There is even less dualism in that than in my Pi example, or in any other kind of file (text, pictures, sound, movie, …) stored in a hard disk.
Haha, no. Strictly speaking, we cannot detect “green” with webcams or computers (such an expression is only a simplification). We can detect light of a particular wavelength with a camera and we can detect a particular value of the G channel with a computer. But that’s not the green color. The green color is what we see (and we can’t even be sure that we see the same color when we use the word “green”). Any equivalence between that and the state of a camera of disk memory is false.
Haha, no. Strictly speaking, we cannot detect “green” with webcams or computers (such an expression is only a simplification). We can detect light of a particular wavelength with a camera and we can detect a particular value of the G channel with a computer. But that’s not the green color. The green color is what we see (and we can’t even be sure that we see the same color when we use the word “green”). Any equivalence between that and the state of a camera of disk memory is false.