diff --git a/README.md b/README.md
index dfefc82..ad08026 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,11 @@ Preis-Thumbnails). Neue Porträts im selben Format ablegen und in `src/data/salo
 laufen beim Scrollen seitlich durch, auf dem Handy wird gewischt. Neues Bild: als WebP (900 px breit) in
 `src/assets/gallery/` ablegen und in `moments` in `Gallery.tsx` eintragen (Titel + Seitenverhältnis).
 
+**Körnung:** Alle Fotos haben einen Filmkorn-Look – Hero fein (Variante A), alle übrigen Fotos wie Film
+ISO 800 (Variante B). Die unbearbeiteten Originale liegen in `design/original/`. Neue oder geänderte Fotos
+dort ablegen (gleicher Pfad wie in `src/assets/`) und `python3 scripts/grain.py` ausführen – das Skript
+schreibt die gekörnten Versionen nach `src/assets/`.
+
 **Direktbuchung:** Jede Leistung trägt ihre Setmore-ID (`id`). Wird bei Setmore eine Leistung
 neu angelegt, bekommt sie eine neue ID. Sie steht im Buchungslink der Leistung auf der
 Setmore-Seite hinter `products=`.
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diff --git a/public/og.jpg b/public/og.jpg
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diff --git a/scripts/grain.py b/scripts/grain.py
new file mode 100644
index 0000000..7e9b6bd
--- /dev/null
+++ b/scripts/grain.py
@@ -0,0 +1,70 @@
+"""Filmkorn auf die Website-Fotos rechnen.
+
+Liest die unbearbeiteten Bilder aus design/original/ und schreibt die gekörnten Versionen
+nach src/assets/. Hero: Variante A (fein), alle anderen Fotos: Variante B (Film, ISO 800).
+
+    pip install numpy pillow
+    python3 scripts/grain.py
+"""
+from pathlib import Path
+
+import numpy as np
+from PIL import Image, ImageFilter
+
+ROOT = Path(__file__).resolve().parent.parent
+SRC = ROOT / 'design' / 'original'
+DST = ROOT / 'src' / 'assets'
+
+VARIANTS = {
+    # fein & dezent
+    'A': dict(amount=0.016, size=1.2),
+    # Film, ISO 800: sichtbares, leicht farbiges Korn, etwas angehobenes Schwarz, leicht entsättigt
+    'B': dict(amount=0.028, size=1.5, color=0.15, lift=0.03, contrast=1.05, sat=0.92),
+}
+
+HERO = {'photos/hero.webp', 'photos/hero-1000.webp', 'photos/hero-mobile.webp'}
+LUMA = np.array([0.2126, 0.7152, 0.0722], np.float32)
+
+
+def noise(rng, h, w, size, color):
+    """Gauß-Rauschen, auf Korngröße weichgezeichnet und wieder auf Standardabweichung 1 normiert."""
+    def one():
+        n = rng.normal(0, 1, (h, w)).astype(np.float32)
+        if size > 1:
+            im = Image.fromarray((n * 40 + 128).clip(0, 255).astype(np.uint8))
+            n = (np.asarray(im.filter(ImageFilter.GaussianBlur(size * 0.5)), np.float32) - 128) / 40
+            n /= n.std() + 1e-6
+        return n
+
+    mono = one()
+    if not color:
+        return np.stack([mono] * 3, -1)
+    return np.stack([mono + color * one() for _ in range(3)], -1)
+
+
+def grain(img, rng, amount, size, color=0.0, lift=0.0, contrast=1.0, sat=1.0):
+    a = np.asarray(img.convert('RGB'), np.float32) / 255
+    h, w, _ = a.shape
+    a = (a - 0.5) * contrast + 0.5
+    lum = a @ LUMA
+    a = lum[..., None] + (a - lum[..., None]) * sat
+    a = lift + a * (1 - lift)
+    # Korn vor allem in den Mitteltönen, wie bei Film
+    lum = np.clip(a @ LUMA, 0, 1)
+    weight = 4 * lum * (1 - lum) + 0.35
+    a = a + noise(rng, h, w, size, color) * amount * weight[..., None]
+    return Image.fromarray((np.clip(a, 0, 1) * 255).astype(np.uint8))
+
+
+def main():
+    for i, src in enumerate(sorted(SRC.rglob('*.webp'))):
+        rel = src.relative_to(SRC).as_posix()
+        variant = 'A' if rel in HERO else 'B'
+        out = grain(Image.open(src), np.random.default_rng(i + 1), **VARIANTS[variant])
+        dst = DST / rel
+        out.save(dst, 'WEBP', quality=82, method=6)
+        print(f'{variant}  {rel:28} {src.stat().st_size // 1024:4} KB -> {dst.stat().st_size // 1024:4} KB')
+
+
+if __name__ == '__main__':
+    main()
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