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So their method uses faces, and it uses faces as an indirect indicator of luminance variation. That is, the users are never making judgements about the colors directly- but rather about faces mapped through the colors. Finally, it doesn't need a calibrated monitor.

Those aspects are shared with our paper. The basic difference is that while Which Blair seeks to quickly evaluate an existing colormap, we want to create a new perceptual colormap from scratch.

The basic change which enables that, is going from a grayscale face (indicating luminance monotonicity), to using a thresholded, bi-level image of a face (to indicate luminance equality, between just two colors).