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FileFormat.info: PNG Format Specification Technical reference guide covering chunk structures and compression standards in PNG files.	Library of Congress: PNG Format Sustainability Archival preservation guidelines and technical specification details for the PNG graphics format.
PNG Development Group Official Site Official home of the Portable Network Graphics (PNG) format, containing specifications, software tools, and history.	Portable Network Graphics describes the features of PNG such as gamma and transparency, with examples; includes browser testing links
W3C PNG (Portable Network Graphics) W3C PNG (Portable Network Graphics)
W3C PNG Specification Official W3C recommendation defining the Portable Network Graphics format structure and rendering rules.