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I believe PNG supports uncompressed files, usually with a compression level = 0.

• klodolph 5y ago
  The data is still a Deflate stream, it's just that the deflate stream will be a series of literal blocks. The idea behind "uncompressed" is that you can just copy the data into memory, and level = 0 does not achieve that (you still have to decode the deflate stream).
  • jfrunyon 5y ago
    ... what decoding needs to be done on a series of literal blocks?