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that's more complicated and "image doubling" is "removed" many months ago. just to be clear NGU is a x2 or x4 scaler liek super XBr.
it is not a good idea to use NGU very high on chroma but NGU low on image scaling.
you should always put more processing power to luma than chroma but that has little to nothing todo with sharpness and more about general quality.
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