A description of a new photographic process in which each shade of gray in an original black-and-white image is seen as a different color in the transformation. The well-known ERTS-1 MSS image of the Monterey Bay-San Francisco area was transformed, using a technique that requires only two intermediate separations. Possible faults were delineated on an overlay of the transformation before referring to geologic maps. All large active or recently active faults shown on the latest geologic map of California were interpreted from the image for all, or much, of their length. An especially interesting result was the Reliz fault; although the fault is shown as covered on the geologic map, a lineation corresponding to the position of the fault is visible on the image. Although the faults are also visible in the unenhanced image, they are clearly accentuated and more easily mapped on the pseudocolor transformation. 11 pp. Ref.
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