Even when we just look around, a wide variety of colors leap into our eyes. We are surrounded by an infinite variety of colors in our daily lives. However, unlike length or weight, there is no physical scale for measuring color, making it unlikely that everyone will answer in the same way when asked what a certain color is. For example, if we say "blue ocean" or "blue sky" to people, each individual will imagine different blue colors, because their color sensitivity and past experiences will be different. This is the problem with color. So let's study a little and determine what kind of color information would be useful.

What color is this apple?
A color expression often means ten different colors to ten different people.
Two red balls. How would you describe the differences between their colors to someone?
Hue. Lightness. Saturation. The world of color is a mixture of these three attributes.
Hue, lightness, saturation. Let's create a color solid.
By creating scales for hue, lightness, and saturation, we can measure color numerically.
Let's look at some color spaces.···I
Let's look at some color spaces.···II
Let's look at some color spaces.···III
Let's measure various colors with a colorimeter.
Colorimeters excel at reporting even minute color differences.
Even if colors look the same to the human eye, measurements with a colorimeter can point out slight differences
Features of colorimeters

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