How is PNG lossless given that it has a compression parameter?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Lost Meadow

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Chapters
00:00 Question
00:38 Accepted answer (Score 194)
01:20 Answer 2 (Score 223)
02:48 Answer 3 (Score 25)
04:25 Answer 4 (Score 17)
09:31 Thank you

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Full question
https://superuser.com/questions/845394/h...

Question links:
[GIMP]: http://en.wikipedia.org/wiki/GIMP

Answer 1 links:
[MD5]: http://en.wikipedia.org/wiki/MD5
[MD5 muxer]: https://ffmpeg.org/ffmpeg-formats.html#m...

Answer 2 links:
[zopfli]: http://googledevelopers.blogspot.co.uk/2...

Answer 3 links:
[wikipedia]: http://en.wikipedia.org/wiki/DEFLATE
[Wikipedia Portable Network Graphics]: http://en.wikipedia.org/wiki/Portable_Ne...
[libpng documentation Chapter 9 - Compression and Filtering]: http://www.libpng.org/pub/png/book/chapt...

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Tags
#compression #png

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