The adaptation of novels is a complicated process that regularly leaves fans and general moviegoers frustrated and unsatisfied. While the appeal of a preexisting audience makes the concept of an adaptation seem like a smart and simple solution to creating a successful movie or television show, it doesn't always work out that way. The adaptation process is a transformation that inherently changes the source material, and sometimes that transformation breaks the bond between the audience and the material.
Source：https://www.cbr.com/the-shining-the-shawshank-redemption-adaptation-problems/
