Filigranes pour Images et Documents PDF : Protection des Droits
Filigranes pour Images et Documents PDF : Protection des Droits
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Formule & Méthode de Calcul
Watermarked Image = Base Layer (Image) + Compositing (Text Layer * Alpha Opacity)
The stamper calculates the diagonal hypotenuse of the image to perfectly center the text, applies a global alpha transparency (usually 30-50%), and permanently bakes the pixels into a new flattened file.
Bonnes Pratiques & Conseils
- Use the Diagonal Pattern: Placing a small watermark in the bottom corner is useless, as thieves can easily crop it out. A repeating, 45 degree diagonal watermark across the center makes the image mathematically impossible to steal cleanly.
- Keep Opacity Subtle: A watermark should protect the image, not ruin it. Set the opacity between 20% and 40% so the underlying subject remains clearly visible to legitimate viewers.
- Use High Contrast Colors: A white watermark will disappear against a snowy background. Advanced watermarks often use a white font with a subtle black drop shadow to ensure legibility across both light and dark pixels.