uni/slides/223015b-2026/assets/demos/psychovisualitaet-grafik.html

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<title>Psychovisualität — Luminanz vor Chrominanz</title>
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  :root {
    --dark: #1a1a2e;
    --muted: #6b7280;
    --soft: #f8fafc;
    --border: #cbd5e1;
    --hl: #d63384;
    --full: #2563eb;
    --reduced: #7c3aed;
    --y: #1a1a2e;
    --cb: #2563eb;
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  .col-tag {
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    font-size: 0.82rem;
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    flex-direction: column;
    gap: 6px;
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<body>
  <h1>Psychovisualität — Luminanz vor Chrominanz</h1>
  <div class="sub">Das Auge sieht <strong>Helligkeit</strong> scharf. <strong>Farbe</strong> darf grob bleiben — und das Bild sieht trotzdem identisch aus.</div>

  <div class="compare">

    <div class="col full">
      <div class="col-head">
        <span class="col-name">Ohne Subsampling</span>
        <span class="col-tag">4:4:4</span>
      </div>
      <div class="col-format">jedes Pixel speichert Y · Cb · Cr in voller Auflösung</div>

      <svg class="preview" viewBox="0 0 320 130" preserveAspectRatio="xMidYMid slice">
        <defs>
          <linearGradient id="full-sky" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#fde68a"/>
            <stop offset="55%" stop-color="#fb923c"/>
            <stop offset="100%" stop-color="#7c3aed"/>
          </linearGradient>
        </defs>
        <rect x="0" y="0" width="320" height="130" fill="url(#full-sky)"/>
        <circle cx="230" cy="50" r="22" fill="#fef3c7"/>
        <path d="M0,90 L40,75 L90,87 L140,68 L190,82 L240,66 L290,80 L320,72 L320,130 L0,130 Z" fill="#1e1b4b"/>
        <path d="M0,108 L60,100 L120,108 L180,98 L240,106 L300,98 L320,103 L320,130 L0,130 Z" fill="#0f172a" opacity="0.7"/>
      </svg>

      <div class="channels">
        <div class="channel">
          <span class="channel-label">Y</span>
          <div class="channel-bar"><div class="fill y" style="width:100%"></div></div>
          <span class="channel-pct">100 %</span>
        </div>
        <div class="channel">
          <span class="channel-label">Cb</span>
          <div class="channel-bar"><div class="fill cb" style="width:100%"></div></div>
          <span class="channel-pct">100 %</span>
        </div>
        <div class="channel">
          <span class="channel-label">Cr</span>
          <div class="channel-bar"><div class="fill cr" style="width:100%"></div></div>
          <span class="channel-pct">100 %</span>
        </div>
      </div>

      <div class="summary-line">
        <span>Datenmenge:</span>
        <span><strong>100 %</strong></span>
      </div>
    </div>

    <div class="col reduced">
      <div class="col-head">
        <span class="col-name">JPEG · H.264 Standard</span>
        <span class="col-tag">4:2:0</span>
      </div>
      <div class="col-format">Y voll · Cb &amp; Cr nur in 2×2-Pixel-Blöcken</div>

      <svg class="preview" viewBox="0 0 320 130" preserveAspectRatio="xMidYMid slice">
        <defs>
          <linearGradient id="red-sky" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#fde68a"/>
            <stop offset="55%" stop-color="#fb923c"/>
            <stop offset="100%" stop-color="#7c3aed"/>
          </linearGradient>
        </defs>
        <rect x="0" y="0" width="320" height="130" fill="url(#red-sky)"/>
        <circle cx="230" cy="50" r="22" fill="#fef3c7"/>
        <path d="M0,90 L40,75 L90,87 L140,68 L190,82 L240,66 L290,80 L320,72 L320,130 L0,130 Z" fill="#1e1b4b"/>
        <path d="M0,108 L60,100 L120,108 L180,98 L240,106 L300,98 L320,103 L320,130 L0,130 Z" fill="#0f172a" opacity="0.7"/>
      </svg>

      <div class="channels">
        <div class="channel">
          <span class="channel-label">Y</span>
          <div class="channel-bar"><div class="fill y" style="width:100%"></div></div>
          <span class="channel-pct">100 %</span>
        </div>
        <div class="channel">
          <span class="channel-label">Cb</span>
          <div class="channel-bar"><div class="fill cb" style="width:25%"></div></div>
          <span class="channel-pct">25 %</span>
        </div>
        <div class="channel">
          <span class="channel-label">Cr</span>
          <div class="channel-bar"><div class="fill cr" style="width:25%"></div></div>
          <span class="channel-pct">25 %</span>
        </div>
      </div>

      <div class="summary-line">
        <span>Datenmenge:</span>
        <span><strong>50 %</strong></span>
      </div>
    </div>

  </div>

  <div class="verdict">
    <div class="verdict-q">Halbe Datenmenge. Identisches Bild — für dein Auge.</div>
    <div class="verdict-a">JPEG, H.264, H.265, WebP — alle reduzieren die Farb-Auflösung auf <strong>ein Viertel</strong>. Das ist Psychovisualität: was wir nicht scharf sehen, muss man nicht scharf speichern.</div>
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