Final answer:
The true statement about color value is that it measures the lightness or darkness of a hue. Value affects our perception of color's depth and is distinct from color purity, which is denoted by saturation.
Step-by-step explanation:
The correct statement about color value is that value is a measure of the lightness or darkness of a hue:
Color value refers to the relative lightness or darkness of a color next to another and it can significantly impact how we perceive a color. Value does not directly involve the display of different categories of features, nor is it a measure of color purity. Instead, saturation speaks to the intensity or purity of a color, and when fully saturated, the color is pure and vibrant.
While hue relates to the color itself and its variations, value dictates the luminosity scale from white to black, impacting the visual depth and realism in an artwork. The perception of colors and their wavelengths involves the response of different types of cones in the human eye to light, but this relates more to hue than to value.