Part A)
Black bars will occur whenever the shape of the screen (in your case 16x9, 1.78x1) and the shape of the movie (in your case 2.40x1) are different. That's basic math.
Part B)
Anamorphic vs. non-anamorphic, letterbox are advanced concepts and suggest you not try to understand them until you make peace with Part A).
Black bars will occur whenever the shape of the screen (in your case 16x9, 1.78x1) and the shape of the movie (in your case 2.40x1) are different. That's basic math.
Part B)
Anamorphic vs. non-anamorphic, letterbox are advanced concepts and suggest you not try to understand them until you make peace with Part A).