Which element is related to the measurement of hue in a design?

The measurement of hue in a design is directly related to chroma. Chroma refers to the purity or intensity of a hue, distinguishing how vibrant or dull a color appears. It indicates how much gray is mixed with a color, affecting its saturation and overall effect in a design.

In contrast, tonal value pertains to the lightness or darkness of a color, which is separate from the hue itself. Scale refers to the size relationships between objects in a design, while rhythm involves the repetition of elements creating a sense of movement or flow. These concepts all play vital roles in design, but when specifically considering the measurement of hue, chroma is the most relevant element.