Chroma bug is a slang name for a Chroma Upsampling Error (CUE). The chroma bug is the tiny horizontal streaks of incorrect coloration that often occur with DVD players. These streaks show along the top and bottom edges of color patches and may also show up during playback as indentations along diagonal color boundaries giving a serrated or comb like edge.
(Adapted with permission from DVD Chroma Upsampling Error, Simplified)
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