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What are Compression Artifacts?

Compression artifacts are unintended visible or audible distortions introduced by an encoding process. They commonly result when information is discarded aggressively or represented with insufficient precision.

How Compression Artifacts work

Lossy encoders allocate a finite representation budget and simplify details that their models consider less noticeable. When that approximation becomes visible or audible, its shape often reveals the underlying transform, prediction, quantization, or temporal decision. Artifacts differ from source noise and transmission corruption, although either can make encoding defects worse. Quality-control stages inspect masters and renditions at actual playback size and over time, not just as isolated frames.

Key facts

  1. Block boundaries become visible when independently coded transform regions receive coarse quantization; deblocking filters can reduce the symptom but cannot recreate discarded detail.
  2. Ringing appears as halos near sharp transitions when high-frequency components are represented poorly, while banding exposes coarse tonal steps in otherwise smooth gradients.
  3. Repeated lossy encoding is not equivalent to copying compressed data: new prediction and quantization decisions can accumulate damage even when the next output uses a higher bitrate.

When Compression Artifacts matter

Inspect for blocking, ringing, banding, smearing, or audio pre-echo when tuning codec settings and bitrates. Re-encoding an already compressed source can compound artifacts even when the later bitrate is higher.

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