superficial image

• Pixel, a word that means picture element, is often used to describes these tiny bits of color. The word halftone, borrowed from the way pictures are printed in books and newspapers, is also used. Pixel, in current usage, implies microscopic or near-microscopic dots that are "on" or "off" and neatly organized. As the accompanying microscopic pictures shows, the implementation of the coloring is more like lines used for shading in an engraving.

  The lines are on the surface only, on fibers that are a fraction of the width of a single hair in a fine artist's paint brush. Paint, in any thick medium, would have resulted in a complete covering over the fibers. Thin paint or dye of any kind would have soaked through, by capillary action, to fibers below. But when image fibers are moved aside with probing needles, the fibers below are clear and uncolored. 

    For an explanation, see Chemistry of the Images.

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