PNG (Portable Network Graphics) Specification, Version 1.2

PNG Working Group (1999-07)

This Page: https://copswiki.org/Common/M1727
Media Link: http://www.libpng.org/pub/png/spec/1.2/png-1.2.pdf%20type%3d%22html%22
More Info: Election Integrity, Open Ballot Initiative

The PNG image standard is a proposed format for The Open Ballot Initiative. It has many positive features:

• CRC error detection on chunk by chunk basis.
• Excellent data compression, not lossy
• Embedded text capability.
• Amenable to inclusion of additional metadata, such as:
  • ballot number
  • precinct number
  • ballot type
  • page of the ballot
  • MD5 or other SHA digest of the entire image.

But there are drawbacks

• Not a multi-image format (does not natively support multi-page ballots)

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