Epson Z8250NL - Manual (Page 174)

Adjusting the Image Quality
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The menu is displayed in the following order.
Signal Menu - Noise Reduction
It is recommended that this is set to Off when viewing image sources in
which noise is very low, such as for DVDs.
Mosquito NR
You can reduce the wavy noise that occurs in lines between areas with
dramatic changes in colors.
The menu is displayed in the following order.
Signal Menu - Mosquito NR