doc: Update and reorganize the png.5 man page
This is a cherry-pick of commit 929ad805c5aa15321e8236897a8b0225607d3182
from branch 'develop'.
Co-authored-by: Chris Lilley <chris@w3.org>
diff --git a/png.5 b/png.5
index c230915..4a8d577 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "July 1, 2025"
+.TH PNG 5 "July 14, 2025"
.SH NAME
png \- Portable Network Graphics (PNG) format
@@ -6,73 +6,76 @@
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
+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.
+.P
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.
+Also, PNG can store color space data for improved color matching on
+heterogeneous platforms.
.SH "SEE ALSO"
.BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
.LP
-PNG Specification (Third Edition), June 2025:
+Portable Network Graphics (PNG) Specification (Third Edition):
.IP
.br
+W3C Recommendation 24 June 2025
+.br
https://www.w3.org/TR/2025/REC-png-3-20250624/
.LP
-PNG Specification (Second Edition), November 2003:
+Portable Network Graphics (PNG) Specification (Second Edition):
.IP
.br
+ISO/IEC 15948:2004(E)
+.br
+https://www.iso.org/standard/29581.html
+.IP
+.br
+W3C Recommendation 10 November 2003
+.br
https://www.w3.org/TR/2003/REC-PNG-20031110/
.LP
-PNG 1.2 Specification, August 1999:
+Portable Network Graphics (PNG) Specification Version 1.2:
.IP
.br
+Published by the PNG Development Group on 14 July 1999
+.br
https://www.libpng.org/pub/png/spec/1.2/
.LP
-PNG 1.1 Specification, December 1998:
+Portable Network Graphics (PNG) Specification Version 1.1:
.IP
.br
+Published by the PNG Development Group on 15 February 1999
+.br
https://www.libpng.org/pub/png/spec/1.1/
.LP
-PNG 1.0 Specification, October 1996:
+Portable Network Graphics (PNG) Specification Version 1.0:
.IP
.br
-RFC 2083
+IETF RFC 2083, March 1997
.br
https://www.ietf.org/rfc/rfc2083.txt
.IP
.br
-or W3C Recommendation
+W3C Recommendation 1 October 1996
.br
https://www.w3.org/TR/REC-png-961001
.SH AUTHORS
-This man page: Glenn Randers-Pehrson, Cosmin Truta
+This man page: Glenn Randers-Pehrson, Cosmin Truta, Chris Lilley.
.LP
-Portable Network Graphics (PNG) Specification (Third Edition).
-W3C Recommendation 24 June 2025:
-Chris Blume et al.
+PNG Specification (Third Edition): Chris Blume et al.
.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), W3C Recommendation 10 November 2003:
-David Duce et al.
+PNG Specification (Second Edition): David Duce et al.
.LP
-Portable Network Graphics (PNG) Specification Version 1.2 (11 August 1999):
-Glenn Randers-Pehrson et al.
+PNG Specification Version 1.2: Glenn Randers-Pehrson et al.
.LP
-Portable Network Graphics (PNG) Specification Version 1.1 (31 December 1998):
-Glenn Randers-Pehrson et al.
+PNG Specification Version 1.1: Glenn Randers-Pehrson et al.
.LP
-Portable Network Graphics (PNG) Specification Version 1.0.
-IETF RFC 2083, W3C Recommendation 1 October 1996:
-Thomas Boutell et al.
+PNG Specification Version 1.0: Thomas Boutell et al.
.\" end of man page
