( < Portable Network Graphics,
"porditav võrgugraafika")

olemus
rastergraafika vorming, kadudeta tihendusega,
loodi asendama omanduslikku levinud vormingut GIF
= a raster image file format that uses lossless compression

ülevaateid
https://www.august.com.au/blog/jpg-vs-png-the-basics/

https://blog.imagekit.io/jpeg-vs-png-vs-gif-which-image-format-to-use-and-when-c8913ae3e01d

https://www.w3.org/TR/PNG-Structure.html

https://en.wikipedia.org/wiki/Portable_Network_Graphics

https://www.oreilly.com/library/view/png-the-definitive/9781565925427/17_chapter-08.html

veebisait
http://www.libpng.org/pub/png/

standardid
https://tools.ietf.org/html/rfc2083

https://www.w3.org/TR/2003/REC-PNG-20031110/

https://www.iso.org/standard/29581.html