Does an object have a color when you do not watch it? Actually no… And more surprising, the object also has no color when you watch it!
What you see is the result of an illuminant of materials’ optical properties, eye properties, and your brain interpretation.
But color can be evaluated (quantitatively). This is Colorimetry science.
In this lesson, we learn about colorimetry, the standard of the color scale, the Color Rendering Index, etc.