Hmmm… I start to feel like we’re in a “How do I inject things into my stomach?” conversation where you may have gotten to an “I need this solution, how do I do it?” without stopping to check that your path along the way was correct.
What effect are you actually trying to achieve? Because it’s sounding more and more like post-processing is not at all what you want.
Edit: background on the “stomach injection” thing. A humorous look at how we often get to a place we didn’t intend through purely logical (but incorrect) jumps: