"vividness" in the noun sense
1. color, colour, vividness
interest and variety and intensity
"the Puritan Period was lacking in color"
"the characters were delineated with exceptional vividness"
2. saturation, chroma, intensity, vividness
chromatic purity: freedom from dilution with white and hence vivid in hue
Source: WordNet® (An amazing lexical database of English)
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