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Any indication of the process used to perform this color analysis? Seems like an interesting technique for breaking down the palette and percentages. Effectiv

• jacobolus 11y ago
  The author eyeballed the sources and manually decided on an abstracted color scheme representation. (Remember, no computers in 1902.) You could do the same thing today in a more automatic way by using by using some kind of clustering algorithm on the colors of pixels. I would recommend first applying some kind of bilateral-filter blur, then clustering the pixels (or some random sample of pixels), representing each cluster by its centroid in a roughly perceptually uniform color space (e.g. CIELAB or CIECAM02), and then apportioning squares to each cluster based on the relative number of pixels included.