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Image processing with canvas. First, the RGB grid is read using getImageData then that grid is compacted so every 9x9 pixel region becomes a pixel with a value equal to the “Most dominant color” in that region. Color is defined as a hue region (with high or low luminosity defined as white and black). The resulting compacted grid is then fed into d3.geom.concaveHull to draw a concave hull around the regions of similar color, which is then filled with the hue and the average saturation and luminosity of that hue across the entire image.

index.html

colornames.js

d3.geom.concaveHull.js