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+.TH PNG 5 "April 14, 2019"
+.SH NAME
+png \- Portable Network Graphics (PNG) format
+
+.SH DESCRIPTION
+PNG (Portable Network Graphics) is an extensible file format for the
+lossless, portable, well-compressed storage of raster images.  PNG
+provides a patent-free replacement for GIF, and can also replace many
+common uses of TIFF. Indexed-color, grayscale, and truecolor images are
+supported, plus an optional alpha channel.  Sample depths range from
+1 to 16 bits.
+.br
+PNG is designed to work well in online viewing applications, such
+as the World Wide Web, so it is fully streamable with a progressive
+display option.  PNG is robust, providing both full file integrity
+checking and fast, simple detection of common transmission errors.
+Also, PNG can store gamma and chromaticity data for improved color
+matching on heterogeneous platforms.
+
+.SH "SEE ALSO"
+.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
+.LP
+PNG Specification (Second Edition), November 2003:
+.IP
+.br
+https://www.w3.org/TR/2003/REC-PNG-20031110/
+.LP
+PNG 1.2 Specification, July 1999:
+.IP
+.br
+https://png-mng.sourceforge.io/pub/png/spec/1.2/
+.LP
+PNG 1.0 Specification, October 1996:
+.IP
+.br
+RFC 2083
+.br
+https://www.ietf.org/rfc/rfc2083.txt
+.IP
+.br
+or W3C Recommendation
+.br
+https://www.w3.org/TR/REC-png-961001
+
+.SH AUTHORS
+This man page: Cosmin Truta, Glenn Randers-Pehrson
+.LP
+Portable Network Graphics (PNG) Specification (Second Edition)
+Information technology - Computer graphics and image processing -
+Portable Network Graphics (PNG): Functional specification.
+ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.
+.LP
+Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
+Glenn Randers-Pehrson and others (png-list).
+.LP
+Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
+Thomas Boutell and others (png-list).
+
+.SH COPYRIGHT
+.LP
+This man page is
+.br
+Copyright (c) 2018-2019 Cosmin Truta.
+.br
+Copyright (c) 1998-2006 Glenn Randers-Pehrson.
+.br
+See png.h for conditions of use and distribution.
+.LP
+The PNG Specification (Second Edition) is
+.br
+Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
+.LP
+The PNG-1.2 Specification is
+.br
+Copyright (c) 1999 Glenn Randers-Pehrson.
+.br
+See the specification for conditions of use and distribution.
+.LP
+The PNG-1.0 Specification is
+.br
+Copyright (c) 1996 Massachusetts Institute of Technology.
+.br
+See the specification for conditions of use and distribution.
+.\" end of man page