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How does dribble’s color search work? It’s not like other search by color features. What I can’t figure out is how they can have search parameters for color variance and color minimum without storing a row for every individual color in an image (which I suppose is possible).
Colors are usually extracted from the image using a histogram computing the density of the colors. Once, you have the top 5/10/15 colors from the image, performing a search is matching the given color against these extracted colors.
To match a given color against other, various techniques are available such as minimizing the euclidean distance between the two colors. More on such techniques can be read at http://en.wikipedia.org/wiki/Color_quantization
Similar strategy is discussed in the blog entry http://mattmueller.me/blog/creating-piximilar-image-search-by-color