Hvordan velge riktig bildefilformat for dine behov

BMP, GIF, PNG, JPG, hva betyr disse tingene? Her er en kort guide om hvordan du velger formatet for bildefilene.

Ditt valg av filformat er egentlig avhengig av hvor mye detaljer og hvor mange farger du ønsker å miste. Lossy bildefilformater reduserer størrelsen på bildefilen ved å miste noen detaljer eller farger, derav navnet!

Generelt websider bruker lossy filformater, for å redusere filstørrelsen, og dermed raskere visning av sider.

BMP. BMP (Bitmap) filer er Windows «standard» bildefil format. Jeg mener «standard» siden 16 bit Windows 3.0. BMP bildefiler er veldig klumpete og mindre. Jeg kan ikke forestille meg noen grunn til å lagre bilder i BMP-format. Det har lossy og lossless versjoner, men i begge tilfeller er det bedre alternativer.

GIF. Grafikk Interface Format er et format med et begrenset antall farger (generelt maksimalt 256 farger per bilde) som har to fordeler:

Det er ideelt for bilder med noen få farger, flat tegneserie som bilder for eksempel. Dette er grunnen til at annonser på websider bruker GIF. Små fotografier (si 300 x 300 piksler maks) kan også se bra ut i GIF-format.

Det er en av de få filformater som kan inneholde animasjon. Igjen dette er grunnen til annonser på websider bruker GIF.

Ulempene av GIF’er:

  • Mangel på farger (bare 256) gjør det uegnet som lagringsformat for store bilder med mange farger.
  • Selv om filstørrelsen er mindre enn BMP, kan det noen ganger være større enn i JPG-filer.
  • Siden det er et komprimert filformat, vil du nesten helt sikkert miste detaljer og farger, hvis du bruker det for store fotografier. Ved store fotografier, mener jeg  størrelsen på bilder som  moderne digitale kameraer produserer, starter på  1024 piksler bred.

PNG. The Portable Network Graphics-formatet ble utviklet for å være et lossless format for bruk på WEB (blant annet). Det reduserer størrelsen på filene dine. Men siden det bevarer alle detaljer og alle fargene, så er ikke reduksonen så mye som GIF eller JPG. PNG er et godt format for lagring av bildene dine. Mest moderne nettlesere støtter PNG, kan du se om din gjør det senere i denne artikkelen ved å trykke på bildet.

JPG. JPG står for Joint Photographic Group, som er navnet på organisasjonen som skapte dette formatet. JPG er designet for lagring av fotografier og er faktisk brukt i de fleste digitale kameraer. Det er lossy, så du mister detaljer, men du kan velge hvor mye detaljer du taper.

I noen maleprogrammer kan du sette JPG kvalitet:

  • Hvis du velger høy kvalitet så JPG-fil vil ha alle detaljene i bildet, men filstørrelsen vil være stor.
  • Hvis du velger middels kvalitet du vil ha en svært anstendig bilde med en rimelig filstørrelse.
  • Hvis du velger lav kvalitet så filstørrelsen vil være liten, men bildet vises uskarpt og klumpete.
  • JPG er stor for å sende fotografier via e-post, og for fotografiske bilder på nettet.

Her er noen eksempler på de ulike formatene.

GIF med små bilder fungerer godt. Størrelse: 83 KB.

GIF med små bilder fungerer godt. Størrelse: 83 KB.

PNG bevarer alle detaljer og alle fargene. Størrelse: 212Kbytes

PNG bevarer alle detaljer og alle fargene. Størrelse: 212Kbytes

JPG i høy kvalitet fungerer godt. Størrelse: 85Kbytes

JPG i høy kvalitet fungerer godt. Størrelse: 85Kbytes

JPG på middels kvalitet fungerer godt. Størrelse: 44Kbytes

JPG på middels kvalitet fungerer godt. Størrelse: 44Kbytes

JPG ved lav kvalitet. Størrelse: 5 kB

JPG ved lav kvalitet. Størrelse: 5 kB

Det siste bildet viser egentlig problemet med lav kvalitet JPG-filer. Men se på filstørrelsen. Bare 5Kbytes!

Oppsummering:
  • Lagre dine digitale bilder og originale kunstverk som PNG-filer.
  • Hvis du putter bilder på nettsidene, eller sende dem via e-post, bruke middels kvalitet JPG.

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