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How to change the mid-tone parameter in a gray image (TIF)

Posted: Thu May 21, 2020 12:35 pm
by SAMSAM
Hi!
Task: Change the mid-tone parameter in a gray image without changing the parameters of light and dark tones.
Is there such a possibility in nconvert using its commands :?: , if not, is it possible to add a parameter to the "-levels " command? :wink: