Editing Mach bands (section)

==In computer graphics==
[[File:Mach bands gradient overshoot.svg|thumb|Example of Mach bands at the ends of gradients where the derivative of the luminance is discontinuous {{olist
    |Actual luminance profile
    |Perceived luminance profile
    |Smooth luminance profile for comparison
}}]]
Mach bands can also appear when there is a discontinuity in the derivative of a gradient, a visual effect common when intensities are linearly interpolated such as in [[Gouraud shading]].

Computer image processing systems use edge-detection in a way analogous to the brain, using [[unsharp masking]] to clarify edges in photos for example.