Not completely true. Some people try and make digital images look film like by adding Gaussian noise. They say that mimics film grain. But that is the opposite of the truth. In digital images the "grain look" is noise. In film, the image is the grain. And, the grain (on a negative) is either opaque (black) or clear, in other words film images are rasterized similar to offset printed images. Unlike digital images where each pixel can have grey tonality from 0 (white) to 256 (black) in 8-bit, film negatives are 0 or 1 (e.g., digital). I hope that is clear now 🙂