Balanced
Balanced starts with the four non-black colors that occupy the most pixels in a Punk. It then selects the one with the highest vividness score. The score rewards saturation while favoring colors near the middle of the HSL lightness range. If none of the four is sufficiently saturated, Balanced uses the most frequent color instead.
Limiting the choice to the four most-used colors makes small bright details less likely to determine the result. The selected color remains one of the Punk's most frequently used colors, while the vividness score distinguishes between them.