Save 100% pixel adjust RGB

[marpet]

Sentinel 3 olci RGB unit interval

This is not easily doable. But you can use the expressions to do it with pconvert. red = Oa09_radiance < 0 ? 0 : Oa09_radiance > 430 ? 430 : Oa09_radiance This limits the values between 0 and 430. For the blue and green channel do it equivalent. As additional option to pconvert use the -s option to disable the skip histogram values. With -s 0,0 nothing will be skipped. I thinks this will do what you want.

Just use the -s option