It might sound like a stupid question, but once you start thinking about it, it's not so simple. For example if you take a color and change the intensity of the light by a factor 2, is it the same color? Also due to overlapping spectra of cones in the human retina, different spectra can generate the same perception of color. Et cetera.
In typical technical contexts, 'color' usually gets it's meaning from CIE 1931 or a derivative of it. The science of human color perception is colorimetry. Photometry is the science of human perception of brightness. Philosophical skepticism deals with the shortcomings of this approach.
I'd assume that with something like intensity that as long as the "ratios" of "RGB" values so to speak stay the same, your brain would interpret it as the same color, but that's my thought!
Probably not true. Different shades of gray have (more or less) the same RGB ratios, but there exists a wide variety of PANTONE numbers for different shades of gray. (Simply put).
It might sound like a stupid question, but once you start thinking about it, it's not so simple. For example if you take a color and change the intensity of the light by a factor 2, is it the same color? Also due to overlapping spectra of cones in the human retina, different spectra can generate the same perception of color. Et cetera.