On the heels of the discovery of the New Mars Face at Meridiani, whose discovery in an Armchair Astronaut occured in a Viking Orbiter image that required slight gamma increase to brighten the face out of the dark patch that appeared in the crater, the many dark patches centered in craters in Viking images understandably became quite interesting...

Many of them, largely the ones whose mysterious black patches can be penetrated by imaging enhancement at all, have already proven to contain faces, just as we were advised by the eagle-eyed (and culturally competent) master of anomalies, the Millenium Cowboy Gordon DeSpain, who was already quite aware there seemed to be a face, or there was something suspiciously like one, in perhaps most of the craters you could name.

These are two only marginally-successful attempts to peel back the darkness in this segment of an MGS Viking context image and find the faces within before stopping to explore the curious shapes that surround the crater.

As you can see, both the positive and the negative of the image were attempted.