2. It may be red, orange, yellow, green, blue, purple, RGB or CMYK.
Or black, white and gray, a bit like various views under the mode option in graphic design, as shown below:
3. Personal sensitivity to color may also vary widely.
The more sensitive, clearer and more demanding,
Maybe graphic designers or people in the color field have different perceptions of color.
Personal guess needs scientific verification, and hopes to be understood by individuals, which involves relevant parameters in the dream field.