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Credits

• compression method tied to image storage format
• different methods alter images in different ways
• file extensions identify image storage format
• LZ or LZW - Lempel-Ziv or Lempel-Ziv-Welch
  • used by GIF and TIF
  • LZW proprietary to Unisys
  • lossy
• RLE - Run-length encoding
  • lossless (very big files)
• TGA (Targa)
  • proprietary to TrueVision
  • lossless (gigantic files)