Anime often features large areas of uniform color. Standard compression can create "banding" artifacts here, where smooth gradients turn into blocky steps.

Many encoders mistake intentional artistic grain for random noise and try to "clean" it, which can destroy the intended aesthetic. The Role of the Dataset

Developers use these clips to see which encoder settings produce the smallest file size while maintaining "perceptual transparency" (meaning the human eye can't tell the difference from the original).

The "anime_comp.7z" archive usually contains raw or "near-lossless" clips of various anime styles—ranging from 90s cel-animated shows to modern digitally-produced series.