uni/slides/223015b/assets/demos/summary-kap02.html

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<title>Was wir über Kompression gelernt haben</title>
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  <h1>Was wir über Kompression gelernt haben</h1>
  <div class="sub">Zwei fundamental verschiedene Wege, dasselbe Ziel: <strong>Daten kleiner machen.</strong></div>

  <div class="compare">

    <div class="col lossless">
      <div class="col-head">
        <span class="col-name">Verlustfrei</span>
        <span class="col-tag">Lossless</span>
      </div>
      <div class="row">
        <div class="row-key">Was passiert</div>
        <div class="row-val">Redundanz raus — Wiederholungen kürzer schreiben</div>
        <div class="row-key">Umkehrbar</div>
        <div class="row-val">Ja. Aus der komprimierten Datei wird das <strong>exakte</strong> Original wieder.</div>
        <div class="row-key">Verfahren</div>
        <div class="row-val">RLE, Huffman, Deflate, LZ77/LZ78</div>
        <div class="row-key">Formate</div>
        <div class="row-val">ZIP · PNG · FLAC · TIFF · RAW</div>
        <div class="row-key">Faktor</div>
        <div class="row-val">2× – 5× (typisch)</div>
      </div>
    </div>

    <div class="col lossy">
      <div class="col-head">
        <span class="col-name">Verlustbehaftet</span>
        <span class="col-tag">Lossy</span>
      </div>
      <div class="row">
        <div class="row-key">Was passiert</div>
        <div class="row-val">Irrelevanz raus — was Mensch nicht wahrnimmt, wird weggeworfen</div>
        <div class="row-key">Umkehrbar</div>
        <div class="row-val">Nein. Einmal weg, für immer weg.</div>
        <div class="row-key">Trick</div>
        <div class="row-val">Psychoakustik (MP3) · Psychovisualität (JPEG)</div>
        <div class="row-key">Formate</div>
        <div class="row-val">MP3 · AAC · JPEG · WebP · H.264 · H.265</div>
        <div class="row-key">Faktor</div>
        <div class="row-val">10× – 100× (typisch)</div>
      </div>
    </div>

  </div>

  <div class="matrix">
    <div class="matrix-head">Entscheidungsmatrix — wann nehme ich welches?</div>
    <div class="matrix-grid">
      <div class="scenario">Foto-Archiv (RAW)</div>
      <div class="answer lossless">Lossless</div>
      <div class="scenario">Spotify-Stream</div>
      <div class="answer lossy">Lossy</div>

      <div class="scenario">Code-Repository</div>
      <div class="answer lossless">Lossless (ZIP)</div>
      <div class="scenario">Instagram-Foto</div>
      <div class="answer lossy">Lossy (JPEG)</div>

      <div class="scenario">Studio-Master-Track</div>
      <div class="answer lossless">Lossless (FLAC)</div>
      <div class="scenario">YouTube-Video</div>
      <div class="answer lossy">Lossy (H.264)</div>
    </div>
  </div>

  <div class="verdict">
    <div class="verdict-q">Lossless für Archiv und Code. Lossy für Streaming und Anzeige.</div>
    <div class="verdict-a">Faustregel: <strong>Werkzeug</strong> (du arbeitest noch dran) → Lossless. <strong>Konsum</strong> (du schaust/hörst nur) → Lossy.</div>
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