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Tone mask.


Screening is proportional to the darkness level, therefore descreening strength should be adjusted to the tone of it's value. e.g. use 100% strength at darkest, 50% strength at midest, 0% strength at brightest.
How to: dupe layer > denoise > reveal mask & apply image from the layercopy with invert value
It can also helpfull to reduce scanning artifact/bleed through on the bright area. in this case, add mask without invertion, then manage tonecurves to get best ballance.