A Psychophysical Perception Enhancement, for use in juxtaposition to a perceptible output spectrum enhanced by (a) in the spectrum, designating a target enhancement region (102 having at least one boundary (104, 105) and (b) proximate to one of the boundaries, defining a perceptible transition region (107, 108) and (c) in that region, applying a filter (110) having a spectral shape substantially inverse to normal perception for the transition region. The enhancement is preferably applicable to a visual or audio systems and can be embodied as a digital, analog, mechanical, passive, optical element.
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