Study by Lâm Vũ Thái Ngọc – Florence Lam 7 min read

1. Wavelength of the rainbow

1.1. The Truth About Hue

• Hue is a color-coded range under the number going from 0 → 360, equivalent to the value of degrees (°) in a circle. It is simulated on the visible light region that the human brain can perceive, which is a spectrum that ranges from red (long wavelength) to violet (short wavelength)
• The colors will be specified to correspond to a relative number of angles so that humans can distinguish different colors when it has been mixed with emission color (Additive color) based on 3 light sources: Red, Green, and Blue.

1.2. Is the red color you see similar to mine?

• Rainbow color band as well as spectrum is a dispersion phenomenon, it is the change of angle of refraction of wavelengths in different colors as is the case with a refracting prism
• Physically, this color band is the region of visible light, where electromagnetic radiation has wavelengths in the range of the spectrum visible to the human eye (i.e., from about 380 nm to 760 nm).
• But in terms of biology, the human eye's ability to perceive colors and perceive depth will also be affected by factors in the eye, including our dependence on the stimulation of photoreceptors, including cone cells (responsible for color perception) and rod cells (responsible for chroma perception)

<aside> 🌱 So it can be said that the actual colors of each person will have a different perceptual information field and the color wavelength is also a factor that governs how you perceive that color.

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1.3. We can see colors that are not real

In fact, the color magenta is not real in reality, it has no wavelength for the human eye to perceive, but in the color system designed on the RGB color model, they are created to link between red and purple (since these two colors are separate at the ends of the spectrum), it is designed to allow the brain to understand and accept the succession of these two colors.

2. Color is the number

2.1. Multiple of color

• Hue has been allocated colors with certain parameters and the numbers are added to 60 degrees.