Guide
Erreurs de compression qui dégradent la qualité d'image
Évitez les erreurs fréquentes qui rendent les images floues ou trop dégradées.
La compression doit alléger, pas détériorer. Quelques mauvaises pratiques expliquent la plupart des défauts visuels.
Mistake 1: compressing without resizing first
Large dimensions plus strong compression can still look bad and stay heavy.
Resize to real display width before adjusting quality.
Mistake 2: using one quality value for every image
A universal setting rarely works across photos, screenshots, and graphics.
Test by content type instead of forcing one number.
Mistake 3: checking only at extreme zoom
Zoomed inspection can hide how files look in actual layout.
Always review images where users actually see them.
- Check mobile first.
- Review text in screenshots.
- Confirm skin tones and edges look natural.
Mistake 4: repeated re-export cycles
Saving the same lossy image many times can stack quality loss.
Keep a high-quality source and export web versions from it.
Mistake 5: ignoring format fit
Wrong format choice can force aggressive compression.
Use formats based on content needs, not habit.
Common situations
- Blurry blog screenshots.
- Noisy product photos.
- Over-compressed hero images.
- Inconsistent image quality across pages.
Small fixes make a big difference
Set simple compression rules and compare output in real page context before publishing.