In an attempt to compare the results of illuminating the same scene by different lighting configurations, it is proposed to drive the image of the scene to a barely visible state (threshold visibility) by masking it, that is, by adding visual noise. The configuration capable of that bearing the greatest addition of noise before losing its intelligibility corresponds to the greatest visibility and therefore the best illumination. We show that for simple scenes the addition of noise has the same effect as decreasing contrast.
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