Compression Artifacts
lastmod 2026-11-10created 2025-03-112 edits
Compression artifacts are noticeable distortions that appear in the output when images, video, or audio are compressed lossily, caused by the information that was discarded. Typical examples include block-boundary noise in JPEG, ringing around edges, color banding, and blocking in low-bitrate video. They get worse as the compression ratio increases, and are mitigated by post-processing such as deblocking filters.