Mark Levinson N 51 - Manual (Page 55)

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Nº51 Media Player Setup Menu
Noise Reduction
This parameter applies a special filter to suppress cross-color
artifacts, where high-frequency luma might improperly display as
“false colors”. Noise Reduction should only be used if cross-color
artifacts are obvious.
Luma Sharpness
This parameter applies Luma enhancement, which improves the
sharpness of edges. The Peaking setting is used to linearly process
the data, and is mostly suitable for small signal amplitudes.
Transient Improvement, a non-linear method of processing, is more
appropriate for improving sharpness and avoiding under- and over-
shoots of peaking.
Chroma Sharpness
The Chroma Sharpness parameter applies chrominance
enhancement, which improves the horizontal transitions of
chrominance signals. Chroma Sharpness should only be used if
blurred colors from source material are obvious.