1. A method for gamut size estimation, comprising: obtaining a color image; processing each of a plurality of pixels of the color image by determining a gamut boundary value for a pixel, wherein the gamut boundary value identifies a smallest size gamut that encapsulates the pixel, and updating a bin of a gamut boundary histogram that corresponds to the gamut boundary value; and determining a gamut size metric based on the gamut boundary histogram, wherein the gamut size gamut is indicative of the minimum gamut needed to represent the color image.