In these sentences:
1-The film wasn't bad but atrocious.
2-The story wasn't funny but ridiculous.
do we need a comma before 'but'?
7. Use a comma near the end of a sentence to separate contrasted coordinate elements or to indicate a distinct pause or shift.
He was merely ignorant, not stupid.
The chimpanzee seemed reflective, almost human.
You're one of the senator's close friends, aren't you?
The speaker seemed innocent, even gullible.