When and how to use internet image formats

What is this guide for? To teach you how to use the correct image formats for the correct situation. I am personally fed up of seeing people use gif for photos, jpeg for Windows screencaps, and other totally inappropriate image format uses. So I made this guide in an attempt to explain how and when to use what formats.

THE SUMMARY:

  • JPEG:
    • Good:
      • Photographs
      • Game screenshots
      • Movie stills
      • Desktop backgrounds
    • Bad:
      • Windows application screenshots
      • Line art and text
      • Anywhere where fine lines or sharp color contrast is needed
  • PNG:
    • Good:
      • Text, line art, comic-style drawings, general web graphics
      • Windows application screenshots
      • When absolutely 100% quality is required (24 bit)
      • When alpha channel support is required
      • As a general replacement for anything that is a non-animated GIF
    • Bad:
      • Photos, in-game screenshots (only when quality is not important and you’re looking for small files)
      • Disappointing browser support from Microsoft and others
  • GIF:
    • Good:
      • Where animations are absolutely required
      • Widespread browser support
    • Bad:
      • Patented, legal techicalities
      • Large file sizes compared to PNG for the same quality
      • Obsolete

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