With the development of wide-gamut display technology, the need is clear for understanding the required size and shape of color gamut from the viewers' perspective. To that end, experiments were conducted to explore color-gamut requirements based on viewers' preferred level of chroma enhancement of standard-gamut images. Chroma preferences were measured for multiple hues using single-hue images, and a corresponding hue-dependent preferred chroma enhancement was successfully applied to natural, multi-hue images. The multi-hue images showed overall success, though viewers indicated that reds could be decreased even further in colorfulness, and yellows could be increased, which may argue in favor of multi-primary displays. Viewer preferences do vary within the population, primarily in overall chroma level, and the differences can be largely accounted for with a single parameter for chroma-level adjustment that includes the preferred hue dependence. Image content dependencies were also found, but they remain too complex to model. The huedependent chroma preference results can be applied to display design and color-enhancement algorithms. © Copyright 2010 Society for Information Display.