by VictorBorun » Sat May 06, 2023 10:01 am
This APOD shows that blue is in fact no primary hue; it is a range from cyan to violet.
Naturally if you take a blue pigment or, as in this picture, a selecting scattering mechanism that favours blue, and then dilute it, you get pale cyan and eventually white; when you thicken a blue pigment, you get dark violet and eventually black.
There can be exclusions to this rule, when your pigment has a narrow-band spectral feature not resolved by trichromatic observers.
One example is water which is a pigment of cyan-green (=aqua), but has an unresolvable narrow band of high transparency in blue range. When you thicken clear water from 2 meters to 200 meters it goes from cyan-green to dark blue, trespassing from one secondary hue range to another.
This APOD shows that blue is in fact no primary hue; it is a range from cyan to violet.
Naturally if you take a blue pigment or, as in this picture, a selecting scattering mechanism that favours blue, and then dilute it, you get pale cyan and eventually white; when you thicken a blue pigment, you get dark violet and eventually black.
There can be exclusions to this rule, when your pigment has a narrow-band spectral feature not resolved by trichromatic observers.
One example is water which is a pigment of cyan-green (=aqua), but has an unresolvable narrow band of high transparency in blue range. When you thicken clear water from 2 meters to 200 meters it goes from cyan-green to dark blue, trespassing from one secondary hue range to another.