Kompresja stratna i bezstratna

Formaty plików i kompresja - Grafika komputerowa w liceum i technikum (paint)

Obraz 1200 × 630 px bez kompresji zajmuje 1200 · 630 · 3 bajty, czyli około 2,2 MB. Pliki są mniejsze dzięki kompresji: - **bezstratna** (PNG, GIF): po rozpakowaniu każdy piksel jest taki sam jak przed zapisem; dobrze ściska duże jednolite płaszczyzny, - **stratna** (JPG): odrzuca szczegóły, których oko słabo widzi; suwak **Jakość** wybiera kompromis między rozmiarem a wyglądem; na ostrych krawędziach i napisach powstają plamy. Otwórz **Zapisz jako** i porównaj rozmiary PNG i JPG przy jakości 90% i 30%.

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