Color resolution refers to the ability of each pixel to represent a number of color tones (also called color depth or bit depth).
Color resolution is normally measured by the level of ability to express the intensity of the 3 primary colors (red, green, and blue).
The number of levels available to represent each color depends on the number of bits that can be used to uniquely characterize each shade.
For example, when using an 8-bit color camera, each individual color has 8 bits or 256 levels (2 to the 8th power) to represent its range.
When evaluating the primary colors (R,G,B), an 8-bit color camera can render 16,777,216 colors (256 × 256 × 256).
On average, it is said that the human eye can differentiate between approximately 10 million colors.
Thus, the representation of 16.77 million colors should be more than enough.
However, in reality, the ability of the human eye to analyze colors differs depending on the color being viewed (e.g. human eyes have a high sensitivity to green).