A camera can capture a scene in all its detail, but if the desired image is constrained in some way, it requires artistry -- a human -- to decide what details to omit to satisfy the constraint. Humans (currently) do better than machines at deciding and depicting the important features of a scene.
The canonical example is if the image is constrained to be black and white (not even grayscale). One could mechanically do halftoning, but suppose an additional constraint that the image must not have high frequency components. This is like constraining an artist to draw with a single color and broad brush, a field with plenty of impressive art.
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