Everything about Mach Bands totally explained
Mach bands are an
optical illusion consisting of an image of two wide bands, one light and one dark, separated by a narrow strip with a light-to-dark gradient. The
human eye perceives two narrow bands of different brightnesses either side of the gradient that are not present in the original image. The illusion is named after
Ernst Mach.
The effect is like that of a
spatial high-boost filter. It is usually supposed that it's caused by
lateral inhibition of the receptors in the eye. An alternative explanation is that visual perception, using a fundamentally statistical strategy, represents the common occurrence of highlights and lowlights in association with luminance gradients.
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