Portable Network Graphics

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Portable Network Graphics (PNG or png; file extension .png) is a lossless compressed image file format.


For Distributed Proofreaders projects, use

  • .png files for:
    • proofing images (page scans)
    • engravings
    • line drawings
    • monochrome images
  • .jpg files for:
    • continuous-tone images
    • paintings
    • photographs
  • either .jpg or .png, whichever yields the better-quality image, for:
    • grayscale illustrations