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This is pure randomness or "color noise", just like picture 1 except that it only varies the color within a small cube in the "green" part of color space. It looks like the same color as picture 3 but here we see variations not only in light-dark but in hue as well. Such an effect can be useful in distinguishing different objects of the same kind in a natural scene -- for instance green trees or foliage. I often use this type of randomness in landscape images.
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