Originally posted by Palynka
So what is the wavelength interval of black?
Wikipedia says this about the subtractive color model:
"A subtractive color model explains the mixing of paints, dyes, inks, and natural colorants to create a range of colors, where each such color is caused by the mixture absorbing some wavelengths of light and reflecting others. The color that an opaque object appears to have is based on what parts of the electromagnetic spectrum are reflected by it, or by what parts of the spectrum are not absorbed."
But, as the screen is not started from white, but from black it is not the subtractive color model we would use, but the additive color model. As Wikipedia says:
"An additive color model involves light emitted directly from a source or illuminant of some sort. The additive reproduction process usually uses red, green and blue light to produce the other colors. See also RGB color model. Combining one of these additive primary colors with another in equal amounts produces the additive secondary colors cyan, magenta, and yellow. Combining all three primary lights (colors) in equal intensities produces white."
So perhaps I should say in my first posting of this thread:
"White is also a primary color."